问题补充:
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
答案:
A. The number of; the number of
B. A number of ; the number of
(答案→)C. The number of; a number of
D. 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。
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