◎ 题干
A number of students_____ playing on the ground but I don't know what the exact number______.

[       ]

A. are; is
B. are; are
C. is; is
D. is; are
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“A number of students_____ playing on the ground but I don't know what the exact number______. [ ]A. are; is B. are; are C. is; is D. is; are …”主要考查了你对  【主谓一致】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。