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
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
单项选择题
He went there ________ meeting some of his friends.
A．hope
B．hoped
C．in the hope of
D．with the hope of
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