What's the l_____ expensive way to travel by train,by bus or by air?

问题描述:

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

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