We'll have a holiday.What about going to the great wall?A three days B three-dayC three-daysD three-days'

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We'll have a holiday.What about going to the great wall?A three days B three-dayC three-daysD three-days'

We'll have a holiday.What about going to the great wall?A three days B three-dayC three-daysD three-days'
We'll have a holiday.What about going to the great wall?
A three days
B three-day
C three-days
D three-days'

We'll have a holiday.What about going to the great wall?A three days B three-dayC three-daysD three-days'
B

A

B

选 B three-day
用连接符 把数词和名词连接起来 充当形容词性质。
例如说, He is a six-year old boy.
During my four-year study in colleage, I learned a lot about English.

b

选B,连接符后不会出现可数名词的复数.