现在完成时表示过去发生并且已经完成的动作对现在造成影响或后果,过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态.
由“but i have forgotten most of it”得知,他的学习并未持续,只是过去的的一个动作,所以应该用learned.
i learned english for four years,but i have forgotten most o
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