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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单项选择题
All ______ to Hong Kong were delayed because of bad weather.
A. fly
B. flights
C. flights
D. flies
单项选择题
It is high time you ______ your membership dues.
A. paid
B. pay
C. will pay
D. to pay
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