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  3. The professor has two sons,_______ are teaching in the same university. ( )

The professor has two sons,_______ are teaching in the same university. ( )

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问题 The professor has two sons,_______ are teaching in the same university. (    )
选项 A、neither of them
B、either of them
C、both of them
D、both of whom
答案D
解析 whom是关系代词，引导非限制性定语从句，先行词是two sons。如果选both of them，后面就是一个完整的句子，逗号不可连接两个句子，因此排除C。由于关系分句中的谓语动词用的是复数are，故选D。答案为D。
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