问题
选择题
The number of teachers in our college __________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
B
“the number of+名词”作主语，谓语动词常用单数形式。“a number of+名词”作主语，谓语动词常用复数形式。