单项选择题

All flights ______because of the snowstorm, we decided to take the train instead.

A．were canceled
B．had been canceled
C．having canceled
D．having been canceled
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单项选择题
Without the friction between their feet and the ground, people would______ be able to walk.
A．in no way
B．on any account
C．by all means
D．in no time
单项选择题
Our company decided to______ the contract because a number of the conditions in it had not been met.
A．destroy
B．resist
C．assume
D．cancel
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