I have a ()vacation.a.seven day b.seven-day c.seven-days d.seven day's

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Ihavea()vacation.a.sevendayb.seven-dayc.seven-daysd.sevenday''sIhavea()vacation.a.sevendayb.seven-day

I have a ()vacation.a.seven day b.seven-day c.seven-days d.seven day's
I have a ()vacation.
a.seven day b.seven-day c.seven-days d.seven day's

I have a ()vacation.a.seven day b.seven-day c.seven-days d.seven day's
b.seven-day
复合形容词
用-连接得的两个词名词不加复数
构成一个复合形容词

a.seven day

C

选择B

B
也可以写
Seven days'

seven-day (as an adjective)

B

.seven-day