I am sure Tom has been here and has done ______.

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问题 I am sure Tom has been here and has done ______.

选项 A、that required him
B、which was required of him
C、what was required of him
D、what has been required him

答案C

解析分析句子可以看出空格处为动词done的宾语部分。what可引导宾语从句，相当于the thing which。其中the thing为has done的宾语，which引导后面的内容作定语。而sth．be required of sb为require的正确用法。故选C。

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英语

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