Everypossiblemeanstopreventthe

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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．has been used	D．have been used

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Her dog ran out of the yard the old lady opened the gate .

A．moment

B．a moment

C．the moment

D．that moment

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I always regret notharder when I was young .

A．studying

B．having studied

C．to study

D．to have studied

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Catherine is one of the brightest students who from the Department of Computer Science , Brown University .

A．is graduated

B．has graduated

C．are graduated

D．have graduated

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The belief that the children of working mothers usually suffer isby most scientists.

A．rejected

B．refused

C．resisted

D．reduced

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Something about his manner suggested that he not interested in what we were doing .

A．was

B．were

C．be

D．is

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