If penicillin had not been available, many people _____ from sickness or even small wounds.A.would dieB.would have diedC.will have diedD.might die
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B解析试题分析：考查虚拟语气：if条件句用had done表示和过去的事实相反，主句用would have done表示虚拟，句意：如果没有青霉素，很多人就会死于疾病或小的伤口。选B。考点：考查虚拟语气
点评：虚拟语气在条件句中的用法是：虚拟条件句 与现在事实相反的假设，从句是If+主语+动词的过去式（动词be用were)，主句是：主语+should,would, might,could＋动词原形；与过去相反的假设从句用：If+主语+had +过去分词，主句是：主语＋should, would, might, could ＋have done；与将来相反的假设，从句用1、If+主语+动词过去式，主语＋should, would do，2、If+主语+were to+ 动词原形，加主句3、If+主语+should +动词原形 ，加上主句的might, could＋动词 原形