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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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相关试题

He _______ in a university for five years, but now he runs a company of his own.

A．has taught

B．had taught

C．taught

D．has been teaching

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Since you are here already, you _______ as well stay here and enjoy yourself.

A．can

B．may

C．should

D．must

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–I tried many times, but I still failed in the experiment.
--Don’t be discouraged. _______ and the problem will be settled.

A．Having a little effort	B．There is a little effort
C．If you have a bit effort	D．A bit more effort

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I try to make him understand that I am not interested in him, but he never gets the ______.

A．information

B．news

C．word

D．message

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Baird invented _______ television, _______ invention that would later completely change people’s life.

A．/; the

B．a; /

C．the; an

D．/; an

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