问题描述：
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
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
问题解答：
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