i have learned english for 3 years.这里哪里错答案是把learn改为been learning我想问learn是延续性动词啊 和for连用为什么不可以?
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![i have learned english for 3 years.这里哪里错答案是把learn改为been learning我想问learn是延续性动词啊 和for连用为什么不可以?](/uploads/image/z/7485630-6-0.jpg?t=i+have+learned+english+for+3+years.%E8%BF%99%E9%87%8C%E5%93%AA%E9%87%8C%E9%94%99%E7%AD%94%E6%A1%88%E6%98%AF%E6%8A%8Alearn%E6%94%B9%E4%B8%BAbeen+learning%E6%88%91%E6%83%B3%E9%97%AElearn%E6%98%AF%E5%BB%B6%E7%BB%AD%E6%80%A7%E5%8A%A8%E8%AF%8D%E5%95%8A+%E5%92%8Cfor%E8%BF%9E%E7%94%A8%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E5%8F%AF%E4%BB%A5%3F)
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