单项选择题

The thief tried to open the locked door but （）.

A．in no way
B．in vain
C．without effect
D．at a loss

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单项选择题
All flights （） because of the snowstorm, many passengers could do nothing but take the train.

A．had been canceled
B．have been canceled
C．were canceled
D．having been canceled
单项选择题
Harry was （） by a bee when he was collecting the honey.

A．stung
B．stuck
C．bitten
D．scratched
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