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    A large number of children ________ standing outside the office when I got there.  The number of the children _____ 2,500.

    A．is; are

    B．is ; is

    C．are ; is

    D．are ; are

     

    【答案】

    C

    【解析】此题考查a number of与the number of的区别。它们修饰名词作主语时，谓语的数是不一样的。a number of为量词短语，表示“许多……”，中心词是这个短语所修饰的复数名词，所以作主语时，谓语动词用复数形式。the number of表示“……的数量”，中心词为number，指的是of后边名词的数量，数量是个抽象概念，因此谓语动词用单数。根据语境的含义可知选择C。

     

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