we chinese wil have a ——vacation.A.seven day B.seven-day C.seven-days D.seven day's

问题描述:

we chinese wil have a ——vacation.A.seven day B.seven-day C.seven-days D.seven day's

we chinese wil have a ——vacation.A.seven day B.seven-day C.seven-days D.seven day's
选B
形容词之间用-连接,都用单数形式