问题补充：
The number of the students in our grade about six ,
of them are girls.
A. are, hundreds, two- thirds
B. is, hundred, two- third
C. is, hundred, two thirds.
D. are, hundreds, two third
答案：
A. are, hundreds, two- thirds
B. is, hundred, two- third
(答案→)C. is, hundred, two thirds.
D. are, hundreds, two third
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