下面一道题值得大家借鉴:
The new sports car is heavier than for a performance automobile, but it is exceptional because of its high-powered engine.
A) usual
B) it is usual
C) one usually is
D) is usual
E) has been usual
It's from 800 score. Here is its explainD) is the correct answer. It employs the parallel construction, 'the sports car is.... than (is) usual for a ...'. (A) is ruled out because it does not create a parallel comparison. In (B), the 'it' is redundant; so is the 'one' in (C). (E) is incorrect because of the verb tense, which should stay in the present. (D) is the best answer because it uses parallel construction.
以上感谢drlucky同学提供的资料!
452.
During the Renaissance, scholars were uncertain as to be location of Troy, and by the eighteenth century many historians (doubted that Troy had ever existed.)
A.
B. doubt that Troy has ever existed
C. were in doubt as to the existence of Troy
D. were doubtful concerning Troy's existence
E. had doubts about Troy's ever existing