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
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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
单项选择题
Having taken our seats,
A．the professor began the lecture
B．the lecture began in no time
C．we were attracted by the lecturer immediately
D．the bell announced the beginning of the lecture
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