the number of the students in our school_____about 2500.a small number of them_______boysa is;are b is;is c are;is d are;are

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the number of the students in our school_____about 2500.a small number of them_______boys
a is;are b is;is c are;is d are;are

分别是is;are

a
the number of.... ....的数字
a small number of... 少数...

a
the number of 是整体概念,表示 总数,后面谓语用第三人称单数 is;
a number of 是指许多,后面用复数。