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thE loss oF this FirE is______thAt oF lAst onE....

B 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。

三友啊

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