一道四级题!The experiment is very expensive.But _____succeed,we would be able to make production more efficient.A.should we B.were weC.would we D.if we应该选哪个?为什么?

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一道四级题!The experiment is very expensive.But _____succeed,we would be able to make production more efficient.A.should we B.were weC.would we D.if we应该选哪个?为什么?
一道四级题!
The experiment is very expensive.But _____succeed,we would be able to make production more efficient.
A.should we B.were we
C.would we D.if we
应该选哪个?为什么?

一道四级题!The experiment is very expensive.But _____succeed,we would be able to make production more efficient.A.should we B.were weC.would we D.if we应该选哪个?为什么?
选A.
因为事情还没发生,所以是虚拟语气.而
在虚拟语气的从句谓语中出现 were, should, had 时, 可以省略if,同时把这个词放到句首,形成倒装.
意思是“一旦成功.”