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
Two boys were caught smoking in school but the principal let them ______ with a warning.
A．alone
B．off
C．in
D．out
单项选择题
______ enough time and money, the researchers would have been able to discover more in this field.
A．Giving
B．To give
C．Given
D．Being given
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