86.选项: (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 正确(C) which have increased 5 percent during the first 3 months of this year after falling (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 比较不能理解C中 一:用have increased,现在完成时不是用来1.表明过去某一部确定时间发生的事情2.表面过去发生的某事对现在仍有影响,或仍持续到现在;那这里用现在完成时是表示哪个哩? 二:falling指的是什么时态?答案中要求increase后于fall,falling是否满足了这个要求? 求路过的高人不要 单纯 路过~~求解答~~ -- by 会员 marshallzhu (2011/4/20 19:17:43)
一:用have increased,现在完成时不是用来1.表明过去某一部确定时间发生的事情2.表面过去发生的某事对现在仍有影响,或仍持续到现在;那这里用现在完成时是表示哪个哩? 是第一个用法。OG说的很清楚,这是一个有时间先后顺序的事件,increase先发生,从而引起一般现在时的measures are evident,因此需要一个先于一般现在时的时态,现在完成或者一般过去。但这个事件是否到现在已经结束?文中并未说明,因此不能用表示increase已经结束的一般过去时——所以这里选择现在完成时。
二:falling指的是什么时态?答案中要求increase后于fall,falling是否满足了这个要求?
falling是过去时,是状语的省略形式,逻辑主语是profits。
参考这个帖子http://forum.chasedream.com/GMAT_SC/thread-35712-1-1.html?SearchText=状语从句的省略
(a) Adverb Clause: While I was walking to class, I ran into an old friend. (b) Modifying Phrase: While walking to class, I ran into an old friend. ---------------------------------------------------------------------------------------------------------- Omit the subject of dependent clause and the be form of the verb, as in (b)
(c) Adverb Clause: Before I left for work, I ate breakfast. (d) Modifying Phrase: Before leaving for work, I ate breakfast. ---------------------------------------------------------------------------------------------------------- If there is no be form of a verb, omit the subject and change the verb to -ing, as in (d)
Conclusion: An adverb clause can be change to a modifying phrase only when the subject of the adverb clause and the subject of the main clause are the same. A modifying adverbial phrase that is the reduction of an adverb clause modifies the subject of the main clause.
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