2. 外语
  3. As is known to us, all the (burn) ______ of any fuel requires oxygen.

As is known to us, all the (burn) ______ of any fuel requires oxygen.

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问题 As is known to us, all the (burn) ______ of any fuel requires oxygen.
选项
答案burning
解析 冠词the后应该加名词，同时其后的名词短语缺少中心词，所以确定应该填名词或动名词。burn兼有名词词性，但意思是“烧伤”，与本题不符，因此应该使用动名词burning，意为“燃烧”。
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