单项选择题

"How long ______________ in the sun You are working too hard!"

A. have you sewn
B. did you sew
C. have you been sewing
D. are you sewing

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单项选择题

We should open the windows often to let______in.

A. the fresh air
B. fresh air
C. a fresh air
D. fresh the air

单项选择题

We are writing to the manager______the repairs recently carried out in our neighborhood.

A. with the exception
B. with the purpose of
C. with reference to
D. with a view to

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