单项选择题

He failed the exam, ______ proved that he hadn’t been working hard enough.

A．that

B．which
C．what

D．of which
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单项选择题
______ the determined captain, all the passengers on board wouldn’t have been saved.
A．It had not been for
B．Had it not been for
C．If it had not for
D．Not had been for
单项选择题
When he was in the countryside, he ______ visit the poor peasants.
A．used to
B．was used to
C．is used to
D．had used to
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