单项选择题

All flights ______ because of the snowstorm, we decided to take the train.

A．were canceled
B．had been canceled
C．having canceled
D．having been canceled
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单项选择题
This watch is ______ to all the other watches on the market.
A．superior
B．advantageous
C．super
D．beneficial
单项选择题
The policemen went into action______when they heard the alarm.
A．promptly
B．presently
C．quickly
D．directly
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