题目内容

The number of teachers in our college _____ greatly increased this term. A number of teachers in this school _____ from the countryside.
A．is; isB．is; areC．are; areD．are; is
B
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。
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