单项选择题

Don't turn on the radio. He ______ for the coming exam.

A．prepare for
B．has prepared
C．is preparing for
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单项选择题
When he opened his eyes, he found himself ______ in the hospital.
A．lie
B．lay
C．lying
单项选择题
I can't help ______ when I heard the interesting news.
A．laugh
B．to laugh
C．laughing
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