They _ so tired if they _ for a whole day .

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They _____ so tired if they _____ for a whole day .
wouldn't be feeling ; hadn't been walking
很明显考的是if 在非真实条件句中的用法
但是那到底是表示对过去还是现在的假设呢.
我应该怎样去区分这样的句子呢
我总觉的应该答案是 wouldn't have been feeling ,hadn't been walking 但是没有那个选项
或者两样都应该行 .
主句表示对现在的假设从句表示对过去的假设
就是表示对过去的假设

主从句各自按照语意显示的时态使用虚拟语气.
"being tired"是现在的状态,所以be虚拟为would be;"walk"是过去的动作,所以did虚拟为had done.

They _____ so tired if they _____ for a whole day . Thanks for _____(buy) me so nice a present.They can _____(he for most people it`s _____ to feel sad if they fail to do so They were tired ___happy after a whole day's work.A and B or they spent the whole day _____ the woods ____ the lost child _____ they were very tired,they fell asleep at once. They _____ for Beijing tomorrow. They feel tired,so they stop ( ) a rest They have _____ for Lucy aas a cleaner. they live _____ if they have babies A.like a family B.alike 完形填空：they plan to s_____ there for a whole day and enjoy the They have a happy _____.