问题
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
B:is, hundred, two- third
C:is, hundred, two thirds.
D:are, hundreds, two third
正确答案是：
