He failed in his exam, __________ proves that he hadn't worked hard enough.

A．what

B．that

C．which

D．such

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参考答案

【译文】他考试没有及格，这证明他学习还不够努力。
【解析】本题考查非限制性定语从句。当关系代词指代一个句子时，只能用which。故选C。

1 __________ is known to all, too much stress can cause disease.

A．Which

B．That

C．It

D．As

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2 It was not until he came back __________ I left the office.

A．then

B．which

C．that

D．when

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3 Only when he finished his homework __________ that he had made a mistake.

A．he then realized

B．did he realize

C．before he realized

D．he realized

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