Which of us ______ knows something about physics does not know this?

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问题 Which of us ______ knows something about physics does not know this?

选项 A、who
B、what
C、whom
D、that

答案D

解析 定语从句题。当主句是以who或which开头的特殊疑问句时,定语从句只能用that引导。故选项D正确。
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