单项选择题

Everybody is looking for you. You ______ home without a word.

A．mustn't leave
B．shouldn't have left
C．couldn't have left
D．needn't leave
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单项选择题
I prefer a university in Beijing to ______ in Shanghai, because Beijing is the cultural center of China.
A．one
B．that
C．it
D．this
单项选择题
The temperature in ______ area will of course partly be determined by how far it is from ______ sea.
A．an; the
B．a; /
C．the; the
D．an; /
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