______many times ,he finally undertood itA.Told B.Telling C.Having told D.Having been told求原因,还有我想知道是不是句首不能用完成时还是什么的,求指教

______many times ,he finally undertood itA.Told B.Telling C.Having told D.Having been told求原因,还有我想知道是不是句首不能用完成时还是什么的,求指教 2道非谓语动词习题,谢绝不相关答案、请自重!1._____ many times,he couldn’t understand it.______many times,he still couldn’t understand it.A.Having been told B.Having told C.He had been told D.Though he had been told请问这两道 ______many times ,he finally undertood it.A.Told B.Having been told1._many times,he finally understood itA.Told B.Having been told B 2._time,the postman refused to deliver our letters unless we chained our dog A Bitten B.Having bitten 为什么这两 He has failed several times . he failed several times的several times是什么成分 翻译: He has been dozens of times. he什么(be)to　shanghai　several　times He telephoned me several times last He was nearly drowned nine times He tried many times and f___he succeeded. He has been abroad many times. He is(confidence)__even though he has failed several times. He eats noodles three times a week.对three times a week提问 He plays football three times a week.对划线部分提问（three times a week） He reads books in the library three times a week(对three times 提问) several times前的时态?比如He _____failed the test several times. he meets friends /three times a month/对three times a month提问 He exercises three or four times a week对three or four times a week