2. 外语
  3. Making the thread run through a hole in the center of the needle (able) ______ the design of the first practical sewing-machine.

Making the thread run through a hole in the center of the needle (able) ______ the design of the first practical sewing-machine.

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问题 Making the thread run through a hole in the center of the needle (able) ______ the design of the first practical sewing-machine.
选项
答案enables
解析 此句缺少谓语，所以将able变形容词为动词enable，然后该动词的主语是第三人称单数，所以enable应变为enables。句意：人们通过将线穿过针中间的洞的原理设计出第一台实用的缝纫机。
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