This computer is of good quality. If it break down within the first year, we would repair

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A. would
B. could
(答案→)C. should
D. might
解析：考查条件句的虚拟语气。本题是一个与将来事实相反的虚拟语气。条件句中有三种情况，过去时；were to do ;should+动词原形，主句使用“情态动词+动词原形”；句意：这种电脑的质量很好，如果在第一年中坏掉，我们会免费为你维修。故C正确。