Oneoftherequirementsforafireisthat the material-中华考试网

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来源 :焚题库 2020-12-21

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单项选择题 One of the requirements for a fire is that the material（）to its burning temperature.

A.were heated

B.must be heated

C.is heated

D.be heated

正确答案：D

答案解析:

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相关知识：第二章、词汇与语法

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