GMAT GWD SC...为什么可以用完成时?38. GWD17-Q38:All Y chromosomes in existence today are descended from a single ancestor’s who is thought to have lived about 140,000 years ago.A. a single ancestor’s who is thought to have livedB. a singl

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GMATGWDSC...为什么可以用完成时?38.GWD17-Q38:AllYchromosomesinexistencetodayaredescendedfromasingleancestor’sw

GMAT GWD SC...为什么可以用完成时?38. GWD17-Q38:All Y chromosomes in existence today are descended from a single ancestor’s who is thought to have lived about 140,000 years ago.A. a single ancestor’s who is thought to have livedB. a singl
GMAT GWD SC...为什么可以用完成时?
38. GWD17-Q38:
All Y chromosomes in existence today are descended from a single ancestor’s who is thought to have lived about 140,000 years ago.
A. a single ancestor’s who is thought to have lived
B. a single ancestor’s who was thought to live
C. a single ancestor whom it is thought had lived
D. the Y chromosome of a single ancestor who is thought to have lived
E. the Y chromosome of a single ancestor whom it was thought had lived
求解答!(答案是D,为什么不能选B?)

GMAT GWD SC...为什么可以用完成时?38. GWD17-Q38:All Y chromosomes in existence today are descended from a single ancestor’s who is thought to have lived about 140,000 years ago.A. a single ancestor’s who is thought to have livedB. a singl
hehe,好怀念~
我们用排除法做题吧
...ancestor's who...指代不清,排除a.b.
...who was...时态错误,既然前面说...today are descended...说明这东西仍旧 is thought to...排除b.e
下一个错误是...whom it...造成从句结构混乱,所以排除c.e
就只剩下d了
这里d 是正确的,这里它不是用的完成时,而是不定式的完成时（perfect infinitives）
这种用法,我可以告诉你在这里是正确的,但是解释起来比较麻烦,也没必要
GMAT 程度的语法,是不需要了解这么深的
因为现代英语里,不定式完成时用得非常有限,通常只出现于虚拟语气之类的特定情况
你在一般的语法书里应该已经找不到了
GMAT SC 里确实会涉及到这种级别的语法现象,但不会是考点,而是作为迷惑点
换句话说,像这道题,你完全可以靠排除法排除其他四个明显错误
考的是你基本知识掌握的牢靠程度,但千万别较真,考试时时间来不及的
考G很辛苦,也很有趣~

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