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

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A. would
(答案→)B. should
C. could
D. might
解析：第一句话用了一般现在时，第二句话的主句却出现了would，这暗示条件句中使用了虚拟语气。由语境可知这里是对将来的虚拟，条件状语从句中可以用“动词过去式/should＋动词原形/were to＋动词原形”这三种形式中的某一种。“should”此时，常译为“万一”。