单项选择题

______you're early you can't be sure of getting a seat.

A. If
B. Unless
C. When
D. Because
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单项选择题
______is well-known, the environment in China is badly in need of improve-merit.
A. It
B. That
C. As
D. What
单项选择题
It is certain that he will______his business to his son when he gets old.
A. take over
B. think over
C. hand over
D. go over
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