单项选择题

Parents often try to impress ______ their children the importance of study.

A. upon
B. to
C. with
D. in
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单项选择题
Don' t watch TV ______ you finish your homework.
A. when
B. while
C. as
D. before
单项选择题
He was brave enough to ______ his opinion in public.
A. speak of
B. speak to
C. speak out
D. speak for
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