Question

I′m very tired. Let′s have a ___________. A twenty minutes r

Answer 1

答案应该是D：a twenty-minute rest.(指的是一个20分钟长的小休,连字符的名词不用变多数）

从上面的选择来说,只能选D,因为 A 是用语上的错误；B 根本无需3个单字相连,前面两个就可以了.C:不完整,没法选.D：最常用,比如：a two-year period,a three-week vacation,等等.