of the workers in this factory is about two hundred. of the workers are working hard.A. Th

of the workers in this factory is about two hundred. of the workers are working hard.
A. The number;The number
B. A number;A number
C. The number;A number
D. A number; The number

A. The number;The numberB. A number;A number(答案→)C. The number;A numberD. A number; The number解析：句意：这个工厂的工人数大约两百。很多工人工作努力。the number of……的数量，a number of很多，许多。故选C。

就是这个解释