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Every possible means ________ to prevent the air pollution，but the sky is still not very clear.

A．were using	B．have used
C．has been used	D．was used

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相关试题

Some girls like to sit in a corner and ______ gossip.

A．organize.

B．swap.

C．forecast.

D．persuade

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A newcomer can find that a new environment is difficult to ______.

A．deal with.	B．be dealt with.
C．dealing with.	D．being dealt with.

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Tom was late for his train, and he asked one of the conductors ______.

A．when was the next train.	B．when the next train was.
C．when is the next train.	D．when the next train.

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It was the first time she______ at a summer school and she really enjoyed it

A．has been.

B．was.

C． had been.

D．would be

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The little girl ______ her heart out because she ______ her toy bear and believed she wasn’t ever going to find it.

A．had cried ; lost	B．cried ; had lost
C．has cried ; has lost.	D．cries ; has lost

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