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标题: 请教几道老题, 多谢! [打印本页]

作者: portland    时间: 2003-1-12 00:45     标题: 请教几道老题, 多谢!

1. The line of descent of apes and humans is believed by most paleontologists (that it split) into several branches some time between 20 million and 5 million years ago
A. that it split
B. to have split
C. to split
D that they were split
E to be split

answer B, 为什么样 C 不行? 不定式用完成时态表过去发生的事情吗?

2. Alcohol may interfere with the abilitty of the brain cells (as they form) the proteins considered essential to short-term memory.
A. as they form
B. forming
C. in the formation of
D  to form
E  when they form

answer D, 我觉得应该是A. as 表原因.

3. The Census Bureau reports that more than three-fifths of all married couples in the United States now have two incomes, significantly more than (earlier decades did).
A earlier decades did
B earlier decades
C in earlier decades
D earlier decades have
E that in earlier decades

answer D, 为什么不是 E
作者: Louisa_xy    时间: 2003-1-12 01:21

1.我认为选C
指出时间是20 million and 5 million years ago,不能用现在完成时呀

2.D the ability of sb. to do
影响细胞合成蛋白质的能力

3.我想选C
作者: 回家过年    时间: 2003-1-12 03:07

en , to have 是不好

d表目的

d不太好吧,decade跟HAVE不好 我也觉得c好一点
作者: lisaislisa    时间: 2003-1-12 16:40

3.E that in earlier decades
that总是不太好 , 修饰married couples , 就该用those
既然一个those也没有, 我也认为c比较好

d结构上一眼看蛮对,now have ; earlier decades have 但逻辑不对耶
错大了

^^
作者: portland    时间: 2003-1-12 23:04

谢谢大家的response

for 1.

根据LZM P98. 不定式的完成体表示不定式的动作发生在谓语动作之前. 所以选B,
因为 split 发生在 believe 之前. make sense?




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