问题补充:
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:
(答案→)A. have, is
B. has, is
C. has, are
D. have, are
解析:考查单复数,主语是A number of books,是复数形式,所以是have,the number of表示…的数量,是单数,所以是is,所以选A