Question

       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

Answer 1

C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