we will have a ______ holiday in may soon.what about going to the west lake

we will have a ______ holiday in may soon.what about going to the west lake
A.three days B.three-days C.three-days' D.three-day
why?
英语人气:234 ℃时间:2019-08-20 00:54:27
优质解答
D
数词与名词组成的复合形容词,用‘-’ 连接,名词不能用复数
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