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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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．Had it not been for
C．If it had not for
D．Not had been for
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