一道英语试题A new study proves a ——— walk every day is enough to k

一道英语试题
A new study proves a ——— walk every day is enough to keep people away from becoming fat .A.30-minute B.30 minutes' C.30-minutes D.30 minute's 帮我说下A和B的区别,选A为什么不能选B

故_意 1年前已收到3个回答举报

四十三锤幼苗

共回答了23个问题采纳率：91.3% 举报

a 30-minute walk,用连字符连接的词,名词用单数
30 minutes' walk 没有连字符的时候,名词用复数的所有格

1年前

再想你的时候幼苗

共回答了6个问题举报

老实说，我觉得B也对
试题出得有问题。楼主不用再费心想了
a 3-year old girl or a 3 years old girl 都对

1年前

ii之子幼苗

共回答了3653个问题举报

a 30-minute walk
= 30 minutes' walk

1年前

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