Question

______ the students in our class is 50 and _______ them study very hard

1. A.
   The number of; the number of
2. B.
   A number of ; the number of
3. C.
   The number of; a number of
4. D.
   A number of; a umber of

Answer 1

C
解析：
短語辨析。The number of……的數(shù)目；a number of 若干；許多。句意：我們班學生的數(shù)目是50，他們中一些學習非常努力。故選C。