【单选题】I am sure Tom has been here and has done ______.
A．that required him
B．which was required of him
C．what was required of him
D．what has been required him
网考网参考答案：C
网考网解析：
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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