Thereanumberofbooksonthebooksh-优题课

题文

There ______ a number of books on the bookshelf. And the number of the books ____ 50.

A．are; are

B．are; is

C．is; is

D．is; are

科目英语题型单选题难度中等

知识点：主语+系动词+表语

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