考察虚拟语气。
1.would been able
2.hadn't went
3.hadn't seen
4.read
虚拟语气的主句，基本上是would /could /might +动词原形
从句三种情况
一，对过去情况的虚拟：had done﹝be 须为were﹞
二，对现在情况的虚拟：动词过去式
三，对将来情况的虚拟：were to do，或者should do﹝此处情态动词必须should！！﹞
1.Had it not been for the PLA ,we _（be able）beat the flood.2
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