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Every possible means ______to prevent the air pollution, but the sky is still not clear.

A．is used

B．are used

C．have been used

D．has been used

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相关试题

But for the metal cage to pull the miners to safety, the miners in Chile ____ in less than twenty-four hours.

A．would not be rescued	B．would not have been rescued
C．would be rescued	D．would have been rescued

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With economy increasing steadily, people ______ enjoy a life of higher quality.

A．should

B．can

C．may

D．must

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The moment the robber came in, gun in hand, all the clerks in the bank stood there, ______.

A．having been astonished	B．astonishing
C．being astonished	D．astonished

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The president was on a tight ______ so he didn’t visit the Forbidden City entirely.

A．schedule

B．plan

C．attitude

D．deadline

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— Don’t put the waste on the ground, young man.
— Oh, I’m sorry. I ______ the dustbin there.

A．hadn’t seen	B．haven’t seen
C．didn’t see	D．wasn’t seeing

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