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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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
() the determined captain, all the passengers on board wouldn't have been saved.

A.It had not been for
B.I4ad it not been for
C.If it had not for
D.Not had been for
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