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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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Had you taken it more seriously, you ________ such a silly mistake.

A．may not make	B．couldn’t make
C．mustn’t have made	D．wouldn’t have made

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_________, the world would be more harmonious.

A．Weren't there any wars

B．There weren't any wars

C．Were there no wars

D．Had there no wars

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（2014） ourselves from the physical and mental tensions，we each need deep thought and inner quietness.

A．Having freed	B．Freed
C．To free	D．Freeing

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______ in a well-known university is what everybody wishes for.

A．Educated	B．Being educated
C．To educate	D．Educating

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_______every member has arrived, let’s set about _____ the plan for the next five years.

A．Since; to work out	B．Because; work out
C．Now that; working out	D．For; work out

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