单项选择题

I missed the morning train because I slept ______.

A. over
B. of
C. in
D. through
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单项选择题
The fact ______ exercise is good for health is known to all.
A. which
B. what
C. that
D. it
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All ______ to Hong Kong were delayed because of bad weather.
A. fly
B. flights
C. flights
D. flies
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