the american president is on his ____visit to China now.Afive days Bfive_day Cfive-days为什么?

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the american president is on his ____visit to China now.Afive days Bfive_day Cfive-days为什么?

此处要填形容词,修饰名词,所以是C.
A FIVE DAY 是一个名词,DAYS
B FIVE-DAY 是形容词但是没复数.