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    【题目】 A number of students_______ playing on the playground, but I don’t know what the exact number_______.

    A. is; is B. are; are

    C. is; are D. are; is

    【答案】D

    【解析】试题分析：a number of一些，许多；the number of……的数目。句意：许多学生正在操场上玩，但是我不知道确切的数目是多少。结合语境可知前文主语为复数形式，故系动词用复数。下文主语number表示抽象含义，故谓语动词用单数，选D。

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