单选题：If two men suspected for some reason they have a common anc

题目分类：成人英语三级
题目类型：单选题
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题目内容：

If two men suspected for some reason they have a common ancestor, __________. A．we can decide according to their family tree
B．we can find the truth from their genetic markers
C．we can compare the differences in their Y chromosome
D．we can look for written records to prove their relationship

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答案解析：

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