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题目
Had known it earlier,I would not have gone back!
在过去之前知道得早点 应该是过去完成时阿!

提问时间:2020-10-16

答案
原句是If I had known it earlier,I would not have gone back!(与过去事实相反,虚拟语气)这里从句与主句主语一致,省略了I和if,是正确的句式.
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