has been doing have been done区别

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• 亲们快来~几道时态填空题/这一课的题目是现在完成时.1时态填空：1）There____________(be)great changes in Shanghai during the past decade.Shanghai _________________(become)more and more beartiful .2)The German engineer ___________________(collect)a lot of Chinese stamps since he came to China,for he _________________(appreciate)Chinese history and culture2用have/has been (to) ,have/has been in ,have/has gone to 填空Where is Sara?She_____1_____Australia.Sounds great.___2_she ________2____
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• 1.-Why are you in a hurry?-( )my mother is ill,I have to take her to hospital.A.For B.Since C.As D.Because2.-Hello,you look tired today.-Yes ,Ispent too late yesterdayevening.I( )my homework and forgot the time .A.was doing B.has done C.have done希望能给讲解一下.
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• have been doing与 have done的用法区别还有一例句:这个问题许多年来使专家们迷惑不解.The problem has bothered the specialists for many years.为什麽不用has been bothering呢?
• I have been doing sth.和I have done sth.有何区别?麻烦各位帮我解决一下英语问题,谢谢!