7、Everypossiblemeanstopreventt

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7、Every possible means ______ to prevent the air pollution, but the sky is still not clear.

A．is used

B．are used

C．has been used

D．have been used

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相关试题

After that, he knew he could __________ any emergency by doing what he could to the best of his ability.

A．get away with	B．get on with
C．get through	D．get across

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He had told her so little that she was all at sea anyhow __________ the whole procedure.

A．in exchange for	B．with regard to
C．by means of	D．in place of

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He wrote to tell me that there was no need to worry about him and he had offered to clean the community __________ a week's accommodation.

A．in exchange for	B．with regard to
C．by means of	D．in place of

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He is teaching me French __________ my teaching him Chinese.

A．in place of	B．in case of
C．in exchange for	D．in honor of

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The committee __________ over the problem among themselves for two hours.

A．has argued	B．has been arguing
C．have argued	D．have been arguing

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