题目内容：

__of people who have lost jobs__day by day,and__of them have found jobs again.
A.A number of; grows ;a number B.the number;reduces;a number

优质解答

B
a number of 许多,作主语时谓语动词用复数,
the number of ……的数量,作主语时谓语动词用单数
根据所给的答案 A 错,因为grows 主语是三单时才用.