虚拟语气They _two free tickets to Canada,otherwise they 'd never

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虚拟语气
They _two free tickets to Canada,otherwise they 'd never have been able to afford to go.
A.had got B.got C.have got D,get
但是我认为是对过去的虚拟,应该选A

本题句意为：
他们拿到了两张去加拿大的票,否则他们绝不能够负担这（旅行的）费用.
B答案正确,并非虚拟,只是对过去事实的陈述.
有虚拟语气的是后面这句：
...otherwise they 'd never have been able to afford to go.
“含蓄条件句”,有时不用if从句表示条件,而是通过介词、副词、分词或短语等代if从句,这里就是otherwise,类似的还可以用without\once\but for等等~
这里有一个would + have done的结构,即情态动词加完成时表示对过去的虚拟：这里意思就是他们（若没有获得票）本来是负担不起这费用因而没办法出行,但是事实上却成功启程了.（对过去的虚拟）
补充情态动词加完成时的语法：
should\could\ought to\would like to等等+have done表示本来应该（能够、打算、想要）做某事,而实际上没有做,其否定句表示本来不应该（不能、不打算）做某事,而实际上做了.needn't have done表示本来没必要做某事,而实际上做了.
希望对你有所帮助=W=

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