单项选择题

There were more than 200 children ______ music in the school.

A．to study
B．studying
C．study
D．studied
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单项选择题
All the lights ______ before we left the office.
A．has been turned off
B．have turned off
C．had been turned off
D．had turned off
单项选择题
Advertising is different from other forms of communication ______ the advertisers pay for the message to be delivered.
A．in order that
B．where
C．in that
D．in the way
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