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
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单项选择题
There were then more than 200 children ______ music in the school.
A．to study
B．studying
C．study
D．studied
单项选择题
______, he doesn't study well.
A．As clever is he
B．He is as clever
C．Clever as he is
D．As clever he is
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