单项选择题

Smoking is not good ______ you because it can affect your health.

A. for
B. at
C. to
D. on
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单项选择题
Everyone is busy ______ the examination in the classroom.
A. with
B. for
C. on
D. under
单项选择题
The girl immediately shut the window to ______ the rain.
A. keep out
B. keep down
C. keep up
D. keep back
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