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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