单项选择题

Not a single word ______ all morning.

A．did he say
B．he said
C．said he
D．does he say
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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
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
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