单项选择题

She couldn't help ______ when she heard the news.

A． laugh
B． to laugh
C． laughing
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单项选择题
You ______ talk so loud in the library.
A． needn't
B． may not
C． mustn't
单项选择题
We decided not to climb the mountain because it was raining ______.
A． hardly
B． strongly
C． heavily
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