Children's brains can't develop properly_______ they lack protein(蛋白质).

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• 1The owner of the cinema needed to make a lot of improvements and employ more people to keep it running, ______ meant spending tens of thousands of pounds.

  A.who

  B.that

  C.as

  D.which

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• 2______ environmental damage is done, it takes many years for the ecosystem to recover.

  A.Even if

  B.If only

  C.While

  D.Once

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• 3In the forest we observed some trees ______ the leaves were black with disease.

  A.where

  B.of which

  C.in which

  D.whose

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• 4The man who was being followed stopped from time to time ______ he wanted to tie his shoelaces.

  A.as if

  B.like

  C.what

  D.as

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• 5It was quite a serious mistake, ______ caused by carelessness.

  A.which I think was

  B.I think which was

  C.which I think it was

  D.I think which it was

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• 6In our university there are several big parks ______ we students can go to enjoy the beautiful scenery．

  A.to which

  B.at which

  C.from which

  D.in which

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• 7I haven't found my watch yet; in fact, I'm not sure ______ I could have done with it.

  A.where

  B.whether

  C.what

  D.how

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• 8This is certainly the case, but ____ it is a mistake or not I don't know.

  A.if

  B.even though

  C.whether

  D.that

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• 9____ he was fired by the company is ______ he didn't work hard.

  A.What; because

  B.Why; because

  C.Why; that

  D.That; because

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• 10People in Chongqing are proud of ______ they have achieved in the past ten years .   

  A.that

  B.which

  C.what

  D.how

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