单选题 Shamir Tech's prediction of revenue ______ during economically difficult times fortunately did not come true during the latest recession.
A. falls
B. were falling
C. falling
D. had fallen

【正确答案】 C

【答案解析】本题的选项都是同一个动词的不同变形，我们首先要判断这个词是否是谓语动词。如果我们能看出这句话的结构是“Shamir Tech's prediction(S)did not come(V)true(C)”，也就能大致判断出此处不能填谓语动词。由此，可以将(A)、(B)、(D)全部排除，就是(C)。只要我们看懂“S+V”的关系，这道看似棘手的题目也就能迅速解出来了。