单项选择题

You look tired. ______ don't you have a rest

A． Why
B． What
C． How
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单项选择题
—May I speak to Peggy—This is ______ speaking.
A． she
B． her
C． she's
单项选择题
Since I began to work here three years ago, this factory ______ in size.
A． had doubled
B． has doubled
C． doubled
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