The number of teachers in our college greatly increased this term. A number of teachers i

问题补充：

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

A. is; is

B. is; are

C. are; are

D. are; is

答案：

A. is; is

(答案→)B. is; are

C. are; are

D. are; is

解析：the number of“的数量”，作主语时，谓语动词常用单数，而“a number of+复数名词”意思是“大量的；许多”，作主语时，谓语动词用复数形式。