求助一道GWD题，时态相关

naiad1981 · 发表于 2010-1-11 15:51:31

??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. a single ancestor’s who is thought to have lived
B.B. a single ancestor’s who was thought to live
C.C. a single ancestor whom it is thought had lived
D.D. the Y chromosome of a single ancestor who is thought to have lived
E.E. the Y chromosome of a single ancestor whom it was thought had lived
?这题答案给的是D,但是 140000years ago 不是应该用过去式吗，但是选项中没有过去式，B选项为什么不正确呢?
?

果汁软糖 · 发表于 2010-1-11 20:27:13

这题的乱码很多额还是复制一下比较好看出来
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
这题翻译过来是这样的，“现在所有的Y染色体都是来自于同一个祖先的染色体，这个祖先被认为生活在140000年以前”
由于染色体是来自于染色体，所以看懂题意以后就可以排除ABC 而时态问题，是这样的，is thought是必须的，不能用was thought，因为though动作发生的时间是现在，而不是以前，所以一定要用现在时这题的亮点是后面live的时态，开始我一直认为live应该用过去式，因为祖先不可能到现在还活着从而需要用have lived，后来琢磨琢磨，才明白原来如果is thought去掉的话，原本的时态应该是had lived的，就是说，在140000年以前ancestor就已经存在了

naiad1981 · 发表于 2010-1-11 21:23:25

非常感谢ls的解释，想通了

求助一道GWD题，时态相关

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