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1、what are you doing？意思是你在干什么？ 2、例句：（1）what are you doing，mon？I need your help.你在干什么妈妈？我需要你的帮助。（2）what are you doing？How can you see?你在干什么？你怎么能看得见？ 3、what are you doing？是特殊疑问句，what are you后要加动词的ing形式...