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

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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