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托福改错题The unit of 1(measurement) known as a "foot" 2(has) ori

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托福改错题
The unit of 1(measurement) known as a "foot" 2(has) originally based on the average 3(size) of the human 4(foot).
请问哪里错了该如何改
托福改错题The unit of 1(measurement) known as a
4--feet 指得是人们的脚,脚都是两个的,所以要用复数
而前面foot,是一个特殊名词,指的是英尺,所以用单数,后面就不能用单数了