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
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______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
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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