单项选择题

The boy spent as much time watching TV as he （） studying.

A．does
B．had
C．was
D．did

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单项选择题
The author of the report is well（）with the problems in the hospital because he has been working there for many years.

A．informed
B．acquainted
C．enlightened
D．acknowledged
单项选择题
All flights （） because of the terrible weather, they had to go there by train.

A．having been canceled
B．had been canceled
C．having canceled
D．were canceled
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