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
I don't think there is()in the book on the desk.

A．something important
B．anything important
C．important something
D．important anything
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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