单项选择题

When we got to the station, the train for Wuhan（）

A．has left
B．left
C．had left
D．leaves

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The professor has finished（）the students' papers.

A．to correct
B．in correcting
C．correcting
D．being corrected
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It is necessary that he（）us.

A．help
B．helps
C．helped
D．would help
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