GWD 17-38

liquid_84

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.

1. a single ancestor’s who is thought to have lived
                       
2. a single ancestor’s who was thought to live
                       
3. a single ancestor whom it is thought had lived
                       
4. the Y chromosome of a single ancestor who is thought to have lived
                       
5. the Y chromosome of a single ancestor whom it was thought had lived

请问D的时态该怎么解释啊，前面讨论的贴子也没解释清楚

 

liquid_84

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顾风

who　is thought说明了是现在最认为。。。

xiangqinzh

下面一段话对D的时态或许有点帮助

这段话是从专业的英文文章下载,

Neanderthals were thought to have died out as modern humans arrived in Europe

当现代人到达欧洲时N已经灭绝了,通常情况会用had died

[此贴子已经被作者于2006-10-20 21:18:01编辑过]

ivymxy

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