复合形容词与名词所有格如何区别?
有一道关于复合形容词和所有格的试题,两者好象都可以,但是标准答案给出的选项是C． B选项错在哪里?急!
How far is it from your home to the museum?
It's about ________.We'd better take a bus to go there.
A twenty minute's walk B twenty -minute walk C twenty minutes' walk
应该选什么?为什么?