单项选择题

—Must I finish this before Monday —No, you ______.

A． mustn't
B． don't
C． needn't

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单项选择题

______ the way, I want to buy some juice too.

A． On
B． In
C． By

单项选择题

I am busy ______ my homework these days after three day's away.

A． do
B． doing
C． in doing

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