They have fallen in love with each other for 2 years.改错!

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Theyhavefalleninlovewitheachotherfor2years.改错!Theyhavefalleninlovewitheachotherfor2years.改错!Theyhave

They have fallen in love with each other for 2 years.改错!
They have fallen in love with each other for 2 years.
改错!

They have fallen in love with each other for 2 years.改错!
fall是短暂性动词,不能用for 2 years
应该是They fell in love with each other 2 years ago.

fall是瞬间动词,不接for 2 years 改成been

fall in love是瞬时动词,不能用完成时,可以改成: They fell in love with each other 2 years ago. 或 They are in love with each other for 2 years.