2. 外语
  3. One of the requirements for a fire is that the material________to its burning temperature.

One of the requirements for a fire is that the material________to its burning temperature.

admin2023-01-28  27
问题 One of the requirements for a fire is that the material________to its burning temperature.
选项 A、heated
B、be heated
C、to be heated
D、being heated
答案B
解析 requirement、order、suggestion、proposal、advice、demand等名词后的主语从句、表语从句或同位语从句需要用虚拟语气，从句的谓语动词一般用“should+动词原形”，其中should可以省略。本句中的material和heat，是被动关系，要用被动语态。故选B。
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