题目内容
【题目】It has been proved ______ he is a smart boy.
A. whoB. whatC. thatD. which
【答案】C
【解析】
句意：已经证明他是一个聪明的男孩。who谁，what什么，that那个，which哪一个。It has been proved that+从句，“已经证明……”，it是形式主语，that引导的真正主语。故选C。
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题目内容
【题目】It has been proved ______ he is a smart boy.
A. whoB. whatC. thatD. which
【答案】C
【解析】
句意：已经证明他是一个聪明的男孩。who谁，what什么，that那个，which哪一个。It has been proved that+从句，“已经证明……”，it是形式主语，that引导的真正主语。故选C。