he has worked out the problem.的被动形式

he has worked out the problem.的被动形式 he worked out math proble____(success) He has already worked for() hour. He has worked there (s) last year he has worked at...和he has been worked at..有什么区别?哪个对呢? who has worked out the math problem被动语态who has worked out the math problem?被动语态 he worked hard,so he worked out of the difficlt problems.同义句 -How long has his father worked in that city?-he has worked there s___ last year. He hasn't worked out the maths problem at The problem is difficult,（ ）he has worked it out.A.howeverB.yetC.whileD.and为什么不能用however而要用yet?具体回答! He said he ( ) in that factroy since 1949.A.has worked B.had worked C.worked D.was working He has worked for a whole day回得来 修改病句:He has worked in Benijing last year. How long has he worked in the radio studio? Can you tell me.合并成宾语从句是he had worked 还是he has worked说明一下理由 The problem is difficult,____,he has worked it out.A:though B:yet C:while D:and请问这题选什么呢?A还是B?为什么?因为我真的不明白,The problem is difficult,____,he has worked it out.A:though B:yet C:while D:and He said ______for the firm for over ten yearsA.has worked B.had worked he has worked as a teacher for only two weeks .he has little e ____ I don't remember where _in that city when he was young.A.did he work B.he worked C.he has workedD.has he worked