题目内容：

----- of the students in our class is fifty-four,and ------ of us are girls.
A.the number;two thirds
B.the number;two third
C.a number;two half
D.a number;three quarters

优质解答

A.the number;two thirds
the number of sth 表示的是..的具体数字
two thirds 是三分之二的意思,当分子大于1的时候,分母的序数词要加s
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