单项选择题

You ______ Mark anything. It was none of his business.

A．needn't have told
B．needn't tell
C．mustn't have told
D．mustn't tell
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单项选择题
The children prefer camping in the mountains ______ an indoor activity.
A．to
B．than
C．for
D．with
单项选择题
Last year, the crime rate in Chicago has sharply______
A．declined
B．lessened
C．descended
D．slipped
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