He could have caused a terrible accident.这句话怎么理解 could have done表示什么

He could have caused a terrible accident.这句话怎么理解 could have done表示什么 caused With only a little more care you ___ the mistake that caused great loss.A.may have been avoiding B.ought to have avoidedC.can have avoided D.could have avoidedWhy 怎么翻译? He did not regret saying what he did but felt that he it differently.A.could express B.would expressC.could have expressed D.must have expressed I don’t think he could have done such a stupid thing last night,____?A.do I B.could he C.did he D.has he His work has ___ his health.The doctor suggests that he travel to the beach to have a holiday.1.affected 2.effected 3.caused 4.brought The flu is believed___by viruses that.causing being caused to have caused to be caused选哪个顺便解释下 Many acidents______ by careless drivers last year.A.are caused B.were caused C.have caused D.will cause I don't think he could have done such a stupid thing last night,__ A.could he B had he Cdid he这里could不是情态动词,have不是助动词吗?为什么要用did?（答案选C） A bump on the head caused her amnesia.I stumbleA bump on the head caused her amnesia.I stumbled and sprained my anked.He spent three months in the hospital with acute arthritis.No one could understand the little baby's babble.He gave a loud belch.Thi He did not regret saying what he did but felt that he________it differently.A.could express B.would express C.could have expressedD.must have expressed He did not regret saying what he did but felt that he could have expressed it differently. he is very creative,because he could have 1903 inventions from 1868 to 1931.He is a talented inve He was able to return .This means he ( )a could if he wanted to b might c could have d did i don't think he could have done better than that,()?A.do i B.don't i C.could he D.couldn't he he regretted what he had done during during the university,he ____the chanceto achieve more life goals.A.could have B.WOULD HAVE C.COULD HAVE HAD D.MUST HAVE HAD could have been done ,could have 找寻错误,并改正,请速回答,1.because of his sickness,he laid in bed ,waiting for the doctor to come.2.Do you really believe that no one could find what had caused the forest fire.