单项选择题

Don' t watch TV ______ you finish your homework.

A. when
B. while
C. as
D. before
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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
单项选择题
What ______ do you want mother asked her son impatiently.
A. in the earth
B. on earth
C. in earth
D. under earth
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