He failed in this exam, ______proves that he wasn't working hard enough.
A.that
B.it
C.what
D.which

A.A.that
B.it
C.what

【参考答案】

D
解析：句意：他没通过考试，这一点说明他学习不够刻苦。本题考查定语从句。本句是非限制性定语从句，引导词要用wh......

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