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

I () writing the article by the time you get back.

A.shall finish
B.must have finished
C.have finished
D.shall have finished

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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