第1个回答 2013-09-21
1.What I have done?2. I have done these hoomework.
第2个回答 2013-09-21
I have changed my attitude.
第3个回答 2013-09-21
I have finished my super.
第4个回答 2013-09-21
1、I have finished the work you distributed to me.2、Human beings are thought to have first entered the Americans.3、I haven’t eaten lunch, so I am hungry.4、You should have your hair cut before having an interview.5、If you have done,I'll explain the matter.