I hear a number of workers in the factory out of work and the number of them quite large .
Aare , is
B. is , are
C. is , is
D. are, are
网友回答
(答案→)A. are , is
B. is , are
C. is , is
D. are, are
解析：
这题考查主谓一致的用法：主语是a number of+可数名词复数，“许多”，时，谓语用复数，主语是the number of+可数名词复数，“…的数量”，时，谓语用单数，所以选A。