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

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

______the students in our class is 50 and ______them study 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 number of

试题答案

C