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The number of teachers in our college _____ greatly increase

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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
The number of teachers in our college _____ greatly increase
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。