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
我选Ａ，答案是Ｄ，我觉得ＴＨＥ Ｙ ＣＨＲＯＭＯＳＯＭＥ ＯＦ．．．好象没有ＡＮＣＥＲＳＴＯＲ＇Ｓ 简洁．我不知道所有格什么时候可以直接加＇Ｓ，什么时候要ＯＦ．．结构．请指教～～～～ＰＬＥＡＳＥ
我觉得是因为who是修饰人，而A选项who修饰了ancestor's 。 of结构用于没有生命的物体， 's用于人
拙见，还是等大牛说吧
A of B 的结构比较好。比较明确
A's 的省略结构不能用
who is thought to have lived修饰的是ancestor
选A的话 ancestor’s 后面接who，那么变成了修饰 Y chromosome
不要忽略了's的所有格，而误以为指代没问题
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 （ancestor’s是物 不能用who指代）
B. a single ancestor’s who was thought to live（ancestor’s是物 不能用who指代）
C. a single ancestor whom it is thought had lived （whom不对）
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（whom不对，时态不对）
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