单项选择题

She ______ the train until it disappeared in the distance, with tears filled in her eyes.

A．saw
B．watched
C．noticed
D．observed
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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
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
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