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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单项选择题
On reaching the top floor I suddenly realized that I ______ my book on the service desk.
A．leaves
B．left
C．had left
D．was left
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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