题目内容

One of the requirements for a fire is that the material _________ to its burning temperature.

A.is heatedB.be heatedC.would be heatedD.shall be heated

B

解析试题分析:句意:对火的要求之一是材料要被加热到燃点。主语是requirement,suggestion,order,advice等词后面的表语从句中用虚拟语气:should do,should可以省略,而且material和heat是被动关系,用被动语态,选B。
考点:考查虚拟语气

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