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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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．Had it not been for
C．If it had not for
D．Not had been for
单项选择题
The professor, together with his students ______ capable of doing the skilled work now.
A．is
B．are
C．being
D．have
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