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
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We'll have an important meeting ______ Monday afternoon.
A． on
B． at
C． in
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If you ______ finish your work now, you must finish it tomorrow.
A． can't
B． needn't
C． may not
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