单项选择题

It is well known that teaching is a job ______ enough patience.

A．calling on
B．calling off
C．calling for
D．calling in
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单项选择题
After 15 years in the United States, he has finally decided to______American citizenship.
A．concentrate on
B．apply for
C．look out for
D．appeal on
单项选择题
In recent years many football clubs()as business to make a profit.

A．have run
B．have been run
C. had been run
D．will run
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