单项选择题


A．strain
B．worry
C．pain
D．trouble
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单项选择题
A．introductionB．controlC．decisionD．direction
A．introduction
B．control
C．decision
D．direction
单项选择题
All flights _________because of the heavy fog, we had to decide to take the train.
A．were canceled
B．having canceled
C．having been canceled
D．have been canceled
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