单项选择题

If you ______ finish your work now, you must finish it tomorrow.

A．can't
B．needn't
C．may not
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单项选择题
The children are making so much noise that I can't hear ______ he is saying.
A．that
B．those
C．what
单项选择题
You must finish doing your homework before I ______ back.
A．will come
B．come
C．came
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