问题
选择题
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
答案
Ａ
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。