--- I hear a number of workers in the factory out of work.
--- Yes, and the number quite huge.
A. are; 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：a number of workers意思是很多的工人，谓语动词用复数。the number of 是……的数目，谓语动词用用单数。