the teachers in their school is about 200 and most of them are teachers.A. A number of ; w

问题补充：

the teachers in their school is about 200 and most 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 表示大量…作为主语时相当于复数形式，而the number of 表示…数量，因而作为主语时，相当于单数形式，同时woman 修饰名词时，变成复数形式，两个都变，故选C