---of the students are interested in learning English 下面有选项

---of the students are interested in learning English 下面有选项
A two thirds
B two third
C Second three
应该选哪个 为什么
还有 怎么翻译我已经来了3次 还想又来第四次?
是不是什么什么序数词+and

A two thirds
分数的表达法是：
分子读作基数词,分母读做序数词.如果分子是一,则分母直接读做序数词；如果分子大于一,则序数词要加s变成复数.2/3 读做 two thirds.动词单复数取决于是指什么的几分之几.
我已经来了3次 还想又来第四次this is the third time I have been here,and I want to be here for a fourth time.