单项选择题

21（）

A．say
B．mean
C．like
D．have

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This year they have produced ______ grain ______ they did last year.
A．as less... as
B．as few... as
C．less... than
D．fewer... than
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
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