the students in our class is 50 and them study very hard.A. The number of; the number of

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

A. The number of; the number ofB. A number of ; the number of (答案→)C. The number of; a number ofD. A number of; a umber of解析：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。

对的，就是这个意思

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