the students in our class is 50 and them study hard. [ ] A．The number of; the nu
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________ the students in our class is 50 and ________ them study hard.
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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
答案：C
解析：