单项选择题

I ______ with all the windows closed, but now I'd like some fresh air.

A．am used to sleep
B．am used to sleeping
C．used to sleeping
D．used to sleep
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单项选择题
He didn't come yesterday. He ______ busy working in the lab.
A．must be
B．would have been
C．must have been
D．would be
单项选择题
It is said that he ______ murder.
A．committed
B．conducted
C．executed
D．emitted
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