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

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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
单项选择题
Tryon was extremely angry, but cool-headed enough to （）storming into the boss's office.

A．prevent
B．prohibit
C．turn
D．avoid
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