请教时态问题：OG12 SC 86

lucifercaters

86. The results of the company’s cost-cutting measures
are evident in its profi ts, which increased 5 percent
during the fi rst 3 months of this year after it fell over
the last two years.
(A) which increased 5 percent during the fi rst
3 months of this year after it fell
(B) which had increased 5 percent during the fi rst
3 months of this year after it had fallen
(C) which have increased 5 percent during the fi rst
3 months of this year after falling
(D) with a 5 percent increase during the fi rst
3 months of this year after falling
(E) with a 5 percent increase during the fi rst
3 months of this year after having fallen

怎么理解此处省略have been ，直接用falling ,有什么依据吗？

lucifercaters

恩，有道理,谢谢!!

Serena11457

现在我明白了，这里falling根本不存在什么省略，也不存在时态问题。

I will go to sleep after completing my homework.
I go to sleep after completing my homework.
I went to sleep after completing my homework.

跟这题完全一样的道理。

dumengxuan

falling的前面到底省略了什么呢？有说省略了have been的，我觉得不对，前面是现在完成时后面还是现在完成时，那岂不是犯了跟A一样的错误？

Serena11457

其实这题通过时态，必须用现在完成时，就锁定C（排除D/E两项with结构，因为ambiguity），lz问得很好！我个人理解，此处falling作为名词(action noun)理解，就避开了棘手的时态问题。
而且就算用动词fall的某种时态形式，也是
....in its profits, which have increased ... during ... after they ....
这里which从句，which指代profits，然后后面又出来they指代profits，很awkward.
所以就干脆用after falling...falling作为名词，来回避after+从句里面从句的问题，而且这表达很准确很简洁。
不知道这样理解对么，请NN指点