One of the requirements for a fire is that the material______to its burning temp

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

选项 A、is heated
B、will be heated
C、be heated
D、would be heated

答案 C

解析这里应用动词原形表示虚拟语气。表示建议、命令、意愿和要求的名词如suggestion，advice，order，requirement，request，demand，recommendation，desire等后面接that从句时，从句的谓语要用动词原形或should+动词原形。

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