-Dad,whenwillyoubufree?Youagreedtogototheseasidewithmefourdaysago.
-Iamsorry,Jean.ButIthinkIwillhavea---holidaysoon.
A.four-daysB.four-day
C.fourdaysD.fourday
为什么?
那C答案后面再加'是对的吗,可以这么做吗?