问题
选择题
If the printer_______ break down under guarantee, we would repair it at our expense.
A．may
B．could
C．might
D．should
答案
答案：D
对将来的虚拟从句用should do 主句用would do，根据本题主句部分谓语用到would repair可知从句应该用情态动词should。所以选D
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