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There are ______ students in the school . But I don’t know _

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There are ______ students in the school . But I don’t know _______ the girls among them .
A.a number of , a number of B.the number of , the number of
C.a number of . the number of D.the number of , a number of
C

 本题考查the number of和 a number of区别。a number of为量词短语,表示“许多……”,中心词是这个短语所修饰的复数名词,所以作主语时,谓语动词用复数形式。the number of表示“……的数量”,后接复数名词,其中,中心词为number,因此谓语动词用单数。