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单选题
30.One of the requirements for combustion（燃烧）is that the materialto its burning temperature.
A
A. is heated
B
B. will be heated
C
C. be heated
D
D. would be heated
答案解析
正确答案：C
解析：
30.【翻译】燃烧的必备条件之一是材料被加热到燃点【精析】C 在proposal, advice, order, requirement, plan, decision等表示建议、要求、命令等含义的名同后面的表语 从句或同位语从句中，从句应用虚拟语气，即从句谓语动词应用“should +动词原形”的形式,should可以省略 另外， material和heat之间为逻辑上的动宾关系，即“材料被加热”，所以应用被动语态。故选C
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