OG13-90 before/after 和完成时

100106ye

The results of the company's cost-cutting measures are evident in its profits, which increased 5 percent during the first 3 months of this year after it fell over the last two years.

(A) which increased 5 percent during the first 3 months of this year after it fell
(B) which had increased 5 percent during the first 3 months of this year after it had fallen
(C) which have increased 5 percent during the first 3 months of this year after falling (正确答案)
(D) with a 5 percent increase during the first 3 months of this year after falling
(E) with a 5 percent increase during the first 3 months of this year after having fallen

OG 解释说 verb tenses 需要被distinguish

可是在曼哈顿p108有这么个例子：
laura locked the deadbolt before she left for work.

“the words before and after indicate the sequence of events clearly and emphatically enough to make the use of Past Perfect unnecessary."

这么理解的话那有了before 和after，就不再需要再次强调tense 的不同啊。求大牛指导TT

100106ye

好像明白点了 谢谢！

marjoriee

孩子，从主句中的动词 are可以知道用现在时态，因为which修饰profits， measures are evident in its profits，而且during the first 3 months 是现在完成时的标志词， after falling是状语从句的省略形式，语义强调的是已经增长，而不是原来的fell，所以选C

boalgmat

before after 的主句与从句有时态递进  说是 before after的从句 后面不能用完成时态  但是主句一般用完成时态