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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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
单项选择题
He （） to his customers and halved the price.

A．leaked
B．drew
C．quoted
D．yielded
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