| _____ we call a machine is really a kind of tool that can do work for man. |
A. When B. That C. What D. Which |
科目：高中英語 來源：同步題 題型：單選題
| _____ we call a machine is really a kind of tool that can do work for man. |
|
[ ] |
| A. When B. That C. What D. Which |
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