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A number of books in the library ____ been stolen so that the number of them ____ smaller than before.

A. has, are B. has, is

C. have, is D. have, are

C

【解析】试题分析:考查谓语动词单复数。a number of 意思是“许多...”,后接复数名词,谓语通常用复数;the number of 意思是“.....的总数”,后接复数名词,但谓语要用单数,句意:在图书馆很多书已经被偷了因此书的总数比以前更少了。故选C

考点:考查谓语动词单复数

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