单项选择题

He is a solemn person ______ temperament so it's extremely hard to make him smile, let alone ______.

A. by, laugh
B. with, laughing
C. through, to laugh
D. by, to laugh
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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
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
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