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    【题目】A number of animals killed and the number of them getting smaller and smaller.

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

    【答案】C

    【解析】

    句意：许多的动物被杀死，它们的数量变得越来越小。根据a number of“许多……；大量……”，作主语时谓语动词用复数；the number of“……的数量”，作主语时谓语动词用单数。故选C

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