The washing machine is of excellent quality. If there __________ be any problem within the first three years, we would fix it for free.A.couldB.mightC.shallD.should
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D解析试题分析：考查虚拟语气：句意：洗衣机质量很好，如果三年之内出现问题，我们免费维修，主句用的是would do表示和将来情况相反的虚拟语气，从句可以四should do，也可以是were to do或过去时。选D。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