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______ the students in our class is 50 and _______ them stud

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______ the students in our class is 50 and _______ them study very hard.
A.The number of; the number of B.A number of ; the number of
C.The number of; a number of D.A number of; a umber of
______ the students in our class is 50 and _______ them stud
C

短语辨析。The number of……的数目;a number of 若干;许多。句意:我们班学生的数目是50,他们中一些学习非常努力。故选C。