He has two children,______have become world-famous scientists.A、none of whoB、al

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问题 He has two children,______have become world-famous scientists.

选项 A、none of who
B、all of whom
C、both of whom
D、one of which

答案 C

解析句意：他有两个孩子，这两个孩子都成了世界闻名的科学家。本句考查的是定语从句的用法。定语从句可由“代词(名词、数词)+介词+关系代词”结构引导。先行词是two children，故关系代词用whom不用which。又none与all代指三人或三人以上，both代指两人，所以选C。

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