用完成时的一题If you the equipment more carefully before sail,we so much trouble now.a.had examined,would not have b.had examined,would not have had选哪个,为什么?

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用完成时的一题If you ____the equipment more carefully before sail,we ____ so much trouble now.a.had examined,would not have b.had examined,would not have had选哪个,为什么?
用完成时的一题
If you ____the equipment more carefully before sail,we ____ so much trouble now.
a.had examined,would not have b.had examined,would not have had
选哪个,为什么?

用完成时的一题If you ____the equipment more carefully before sail,we ____ so much trouble now.a.had examined,would not have b.had examined,would not have had选哪个,为什么?
选A
如果你在航海之前就已经把设备检查过的话,我们现在就不会有那么多麻烦.
would not have trouble是一种虚拟表示方式,指我们就不会有麻烦了
would not have had 是指我们就不会已经有那么多麻烦.
显然,后面那句的意思并不是非常恰当,此处无须用完成时态.

选a 这是条件从句的第四种混合式强调过去的行为对现在的影响
主句had done ，从句 would do 恒久不变

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