单项选择题

He doesn't come today. He ______ be ill.

A． must
B． can
C． should
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单项选择题
I______ from him since he left.
A． didn't hear
B． haven't heared
C． haven't heard
单项选择题
It's cold outside. You'd better ______ your coat.
A． to put on
B． put on
C． take off
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