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    A number of students ______ playing on the ground but I don't know what the exact number______.

    A．are; isB．are; areC．is; isD．is; are

    A

    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A。
    考点：主谓一致
    点评：由number构成的这两个短语是经常考查的对象，其一般解题原则是先区分这两个短语的含义，然后结合语境选择正确答案。其结构，含义比较固定，熟记即可。

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