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
网友回答
A. have , is
B. has , is
C. has , are
D. have, are
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。