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________ students in the classroom ______ twenty. The others are in the library.

A.The number of ; is B.A number of; are
C.The number of; are D.A number of ; is

A

解析试题分析:句意:教室里学生的数量是20.其他人在图书馆。the number of...的数量,做主语时谓语动词用单数;a number of一些,做主语时谓语动词用复数。故选A。
考点: 考查主谓一致。

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