A number of books in the library ___been...

A number of books in the library ___been stolen so that the number of them___ smaller than before.

A．have , is

B．has , is

C．has , are

D．have, are

Ａ【解析】考查主谓一致。A number of许多大量（修饰可数名词复数形式）；谓语动词用复数。The number of指…的数量；谓语动词用单数。句意：图书馆里的很多书都被偷走了，以至于书得数量比以前少了很多。故A正确。

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