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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He failed the exam, ______ proved that he hadn't been working hard enough.
A．that
B．which
C．what
D．of which
单项选择题
There are ______ students playing basketball in the room.
A．score of
B．scores of
C．two scores
D．two score of
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