The washing machine is of excellent quality. If there be any problem within the first three years, we would fix it for free.
A. could
B. might
C. shall
D. should
网友回答
A. could
B. might
C. shall
(答案→)D. should
解析：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。