单项选择题

This year they have produced ______ grain ______ they did last year.

A．as less... as
B．as few... as
C．less... than
D．fewer... than
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单项选择题
I didn't hear the phone. I ______ asleep.
A．must be
B．must have been
C．should be
D．should have been
单项选择题
Cheap coal ______ a lot of smoke.
A．gives up
B．gives in
C．gives away
D．gives off
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