The unit of Ameasurement known as foot Bhas originally based on the average Csize of the human Dfoot.

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问题 The unit of Ameasurement known as foot Bhas originally based on the average Csize of the human Dfoot.

选项 A、 
B、 
C、 
D、 

答案B

解析 应改为was。be based on:以……为基础。根据句意,应把has改为be的过去式,即was。
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本试题收录于: 英语题库普高专升本分类
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