the teachers in their school is about 200 and one fourth of them are teachers.A. A number

问题补充：

the teachers in their school is about 200 and one fourth of them are teachers.

A. A number of; women

B. A number of; woman

C. The number of; women

D. The number of; woman

答案：

A. A number of; women

B. A number of; woman

(答案→)C. The number of; women

D. The number of; woman

解析：A number of若跟；一些；许多。The number of……的数目。Women是woman的复数形式。句意：他们学校的老师的数目是大约200人，他们的四分之一是女老师。如果用man/woman做定语修饰名词，在变复数形式时，必须两个名词一起都变成复数。故选C。