单项选择题

Be quiet and ______ your work.

A． you do
B． to do
C． do
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单项选择题
You look tired. ______ don't you have a rest
A． Why
B． What
C． How
单项选择题
—May I speak to Peggy—This is ______ speaking.
A． she
B． her
C． she's
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