题目内容：

It's( )walk from my home to our school A.twenty B.twenty minutes C.twenties minutes D.twenty-minute
选什么?为什么选?

优质解答

It's a twenty-minute walk from my home to our school.
选D,但句中的 walk 是名词,所以要加在twenty-minute的前面加a,而twenty-minute 作定语,词尾不带s.