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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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