Question

帮忙讲解一下这道英语题，谢谢

This printer is of good quality.If it____break down within the first year,we would repair it at our expense.
A.would
B.should
答案是哪个，请详细解释一下吧，3Q~~

Answer 1

选B.
这是一个虚拟语气，if虚拟条件句中，表示与将来情况相反时，条件句谓语有三种：
1.过去时
2.should+do
3. were to do
该题就是第2种，其中的should不能用would/could替换

Answer 2

答案是B. should在这儿是“万一”的意思。“假设它在第一年内出故障，我们会免费修理。”