单项选择题

Both he and I ______ hard at Chinese.

A．am working
B．is working
C．are working
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单项选择题
This factory has been ______ for two weeks.
A．open
B．opening
C．opened
单项选择题
—Must I dean the room now—No, you ______.
A．can't
B．mustn't
C．needn't
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