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Notallofusknowthedifferencewheat,oatsandbarley.为什么用between而不用among?

题目详情
Not all of us know the difference ___wheat ,oats and barley.为什么用between而不用among?
▼优质解答
答案和解析
among,也许原句有误
3者间或以上用among,2者间用between