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

The professor, together with his students () capable of doing the skilled work now.

A．is
B．are
C．being
D．have

单项选择题

-- What about the book --Oh, very good. It's worth () a second time.

A．reading
B．being read
C．to read
D．to be read

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