求教 This printer is of good quality.If it ________ break down

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求教 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 ,C could ,D might 答案是B但是我不知道为什么

B是对的,这是一种虚拟语气,表示与将来的事实相反或者可能性极小.
“虚拟将来时将来的假想情况还可用should引起短语表示,表示实现可能性不大的情况,可译为“万一……”,这时主句中的谓语动词用will或would引起都可以：
If he should know it,he will/would tell me.(But I DOUBT whether he knows it.)
If Mary should have the money,she will/would buy it.(But I DOUBT whether she has the money.)
I shall(=I certainly will,表示决心） defend myself if he should attack me.
The poor driver was _____ that the best way should be to call a beekeeper.
A.advised B.required C.ordered D.requested
(2005年高考重庆卷)
（advise跟that从句时,从句用虚拟语气,即should+动词原形.）

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