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the american president is on his ____visit to China now.选哪个为

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the american president is on his ____visit to China now.选哪个为什么?
the american president is on his ____visit to China now.
A five days B five day C five-day D.five-days
选哪个为什么?
麻烦解释下原因,和翻译下
C five-day
美国总统正在进行他为期五天的中国访问.
C 要用连线因为five-day是用作一个形容词来修饰visit.当天数用作形容词,就要加连线号.
A five days是五天,但是名词,不能用作形容词.
B five day是复数,不能不加s
D five-days,加了连线号就不用加s