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While every possible means __________ to prevent the river pollution, the river in my hometown has still not been restored to its past beauty.

A．is tried	B．are tried
C．has been tried	D．have been tried

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Tell me when you ________ at the airport, Alice. I’ll go there to meet you if I’m here.

A．arrive	B．would arrive
C．have arrived	D．are arriving

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There is still much to discuss. We shall, ______, return to this at our next meeting.

A．so	B．however
C．because	D．Therefore

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--An explosion at a coal mine of Panzhihua killed at least 43 workers and left another 3 missing.
--Yes,_______ news came as _______ shock to us all.

A．the; the	B．a ; /
C．/ ; a	D．the; a

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Tom was the first man _______ after the accident.

A．questioned	B．to question
C．to be questioned	D．being questioned

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How long do you think ________the car factory launches a new model?

A．will it be until	B．it will be before
C．will it be when	D．it will be that

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