Mr.He had changed his mind and decided to open the mould exactly as original sample这句用的had对吗?为什么?为什么也可以用has?用had和has各有什么不同？定重谢！

Mr.He had changed his mind and decided to open the mould exactly as original sample这句用的had对吗?为什么?为什么也可以用has?用had和has各有什么不同？定重谢！ He had changed so much that I could hardly know him.改错 英语:He had changed so much that I couln't --------(辨认) him on his arriving. How long has he ---------the job A found B changed C had Only when the meeting began________ that he had left his papers at his office.Mr.White was made ______ general manager of the company yesterday.Look,____ new manager is coming!A a,the B 不填,the Only when the meeting began _____ that he had left hi mr.johnson is interested in all things and people __have changed greatly since he left his.为什么选that 完形填空 Mr LI had never been up in an airplanebefore and he had 原句是He had changed so much that I could hardly recognize him.改为倒装句,正确答案是So much had he changed that I could hardly recognize him.我想问为什么不能改为So much changed he had that I could hardly recognize him.changed When he had killed the guard,the prisoner of war _____ the dead man's clothesA.turned intoB.changed intoC.changed out ofD.turned out选哪个?为什么? then Mr.Greed suddenly realized that he had seen the man before.请高手翻译句子 he had seen He had changed.No one recognized him.(so much that)用括号里的连词改写句子 When he__his native country ,he found it had changed a lot.a.returned backb.returned toc.returned back tod.returned He traveled to many mountain villages .This experience __ his lifeA would changeB had changeC was to changeD was changing ---Hello,my name is Jphnson.I believe you have a roo____for me.---Johnson?Oh,yes,Mr Johnson It's Room 1201,on the second floor.A.looked B.waited C.has changed D.had changed Don’t always make michael__this or that.he is already a big boy,dear,Mr Bush said to hi wife. Mr Smith had a tirp to China last summer.Which phone did he take there? Mr Smith had a tirp to China last summer.Which photo did he take there? Mr Black had to go back,后面填hadn't he?这个是特殊用法吗？