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、be heated
B、is heated
C、would be heated
D、to heated

答案 A

解析虚拟语气。requirement，idea，suggestion等一样，要求从句里的谓语动词用(should)+动词原形。

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