The number of teachers in our school greatly increased last term.A number of teachers in

问题补充：

The number of teachers in our school greatly increased last term.A number of teachers in this school from the countryside.

A. was;is

B. was;are

C. were;are

D. were;is

答案：

A. was;is

(答案→)B. was;are

C. were;are

D. were;is

解析： The number of指：“……的数目”，它所修饰的主语的谓语动词用单数：A number of，它所修饰的主语的谓语动词用复数，故选B