单项选择题

I______ from him since he left.

A． didn't hear
B． haven't heared
C． haven't heard
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单项选择题
It's cold outside. You'd better ______ your coat.
A． to put on
B． put on
C． take off
单项选择题
He ______ asleep when he was reading.
A． was falling
B． fell
C． falls
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