单项选择题

Were you ______ the phone a lot this afternoon I tried calling you five times and always got a busy signal.

A．on
B．in
C．at
D．by
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单项选择题
Mary was astonished that she ______ for the counselor's position,
A．turned on
B．was turned down
C．turned off
D．was turned back
单项选择题
In the past, we needed ______ than today.
A．less mathematic
B．fewer mathematic
C．less mathematics
D．fewer mathematics
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