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Dear friends, please help me to solve these questions

18.Although the Supreme Court ruled as long ago as 1880 that Blacks could not be excluded outright from jury service, nearly a century of case-by-case adjudication has been necessary to develop and enforce the principle that all juries must be drawn from“a fair cross section of the community.”
(A) has been necessary to develop and enforce the principle that all juries must be
(B) was necessary for developing and enforcing the principle of all juries being
(C) was to be necessary in developing and enforcing the principle of all juries to be
(D) is necessary to develop and enforce the principle that all juries must be
(E) will be necessary for developing and enforcing the principle of all juries being
pls.analyze A. E.



21.The Olympic Games helped to keep peace among the pugnacious states of the Greek world in that a sacred truce was proclaimed during the festival's month.
(A) world in that a sacred truce was proclaimed during the festival's month
(B) world, proclaiming a sacred truce during the festival's month
(C) world when they proclaimed a sacred truce for the festival month
(D) world, for a sacred truce was proclaimed during the month of the festival
(E) world by proclamation of a sacred truce that was for the month of the festival
pls. analyze B.C.



11. According to a study by the Carnegie Foundation for the Advancement of Teaching, companies in the United States are providing job training and general education for nearly eight million people, about (equivalent to the enrollment of) the nation's four-year colleges and universities.
(A) equivalent to the enrollment of
(B) the equivalent of those enrolled in
(C) equal to those who are enrolled in
(D) as many as the enrollment of
(E) as many as are enrolled in
pls. analyze D.E.



16.Carbon-14 dating reveals that the megalithic monuments in Brittany are nearly 2,000 years (as old as any of their supposed) Mediterranean predecessors.
(A) as old as any of their supposed
(B) older than any of their supposed
(C) as old as their supposed
(D) older than any of their supposedly
(E) as old as their supposedly
pls. analyze A.B.



20.The use of chemical pesticides in this country is (equally extensive or more so than ten years ago).
(A) equally extensive or more so than ten years ago
(B) equal to or more extensive than ten years ago
(C) as extensive as ten years ago or more
(D) equal to, if not more, than ten years ago
(E) as extensive as it was ten years ago, if not more so
pls. analyze C.E.




14.During the Great Depression , industrial output fell by nearly fifty percent from its peak in 1929 down to its nadir in 1933.
(A) During the Great Depression , industrial output fell by nearly fifty percent from its peak in 1929 down to its nadir in 1933
(B) During the Great Depression , industrial output fell by nearly fifty percent from its peak in 1929 to its nadir in 1933
(C) At the time of the Great Depression, industrial output fell by almost fifty percent from its 1929 peak down to its 1933 nadir
(D) At the time of the Great Depression, industrial output fell by almost fifty percent from it peak in 1929, by nearly fifty percent, to its nadir in 1933
(E) During the Great Depression, industrial output fell from its peak in 1929 to its nadir in 1933 by nearly fifty percent
pls. analyze A.B.E

[em27]
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18、A。
1)时间是持续的。
2)necessary to do sth
21、C
1)B的 proclaiming 修饰不明
2)C中的they就近指带比较明确,而且句仪清晰。
11、E
1)可数名词用many。
2)名词enrollment与people不能对应
3)was 的主语很明确是people。
16、已经提出了2000年,从逻辑上讲是早2000年,所以不能用as。。。as
20、E
表达清晰。C 若改成as 。。。as,or more ,。。。可能比较好。
14、
A)多了个DOWN
B)正确
E)将by nearly fifty percent放在后面,这种排列不好
Robert之家-----我的家园

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thanks for your answer, but i still have questions.
1, regarding no.21, how come the Olympic Games can do something by itself. if we meet the Olympic Games next time, it refers to people or a thing? Or does it always refer to people?

2, regarding no.16, from my understanding, the dating reveals that the  monuments are as old as any of their supposed predecessors. the exact 2000 years just modify the monument, giving it an exact date.

3, regarding 20, could you please rewrite choice C, using your correct structure?

thanks a lot.

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