What's the l_____ expensive way to travel by train,by bus or by a_英语解答

What's the l_____ expensive way to travel by train,by bus or by air?
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wiwicat ,但它是两者比较啊...
.不好意思..看错的

人气：280 ℃　时间：2019-10-23 11:37:52

解答

least 最便宜的
前面有the 所以要用最高级
train,bus,air,是三者比较