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

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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、should heat
C、should be heated
D、heated

答案C

解析本题综合考查虚拟语气和被动语态。题意为，起火的必要条件之一是材料被加热到它的燃点。主句中的requirement要求其从句用虚拟语气should+动词原形。

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