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the number of the students in their school is over nine hund

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the number of the students in their school is over nine hundred.此处为什么用is 而不用are
the number of the students in their school is over nine hund
这里的主语是the number of ,表示“……的数量,”而不是“students”,因此谓语动词是用单数,is. 但是如果变成“a number of students"作主语的话,表示很多学生的话,谓语动词就要用复数.
比如:
the number of students in our school is 200.
a number of students in our school are fond of football.