Having been ill in bed for about two months,he had a hard time toclimb the hill我想知道开头为什么用having been?其他形式的非谓语为什么不可以?

Having been ill in bed for nearly a month,he had a hard time______the exam.A.pass B.to pass C.passed D.passing ____for a long time ,but jim tried his best to catch up with his classmatesA Being ill B Though he had been ill C He had been ill D Having been ill 选什么,Why?Though和but不能兼得！ ____,so he didn't come to school last week.A.Though he was ill B.being ill C.Having been ill D.He was 选哪个?为什么? having been ill in bed for nearly a month,he had a hard time（）the exam.为什么填passing 20.-----for a long time,but he tried his best to catch up with his classmates.A.Having been ill B.Being ill C.Tough he was ill D.He was ill ____for a long time,but he managed to catch up with his classmates at last.A.Having been ill B.Being ill C.He was ill D.Though ill —————for quite some time ,he caught up with his classmatesA having been ill B being ill C he was ill D ill as he was 选d为什么 _____for a long tine,but he tired his best to catch up with his classmatesa.having been ill b.being ill c.he was ill d.phenomenon不好意思 D.是TO BE ILL Having been ill in bed for about two months,he had a hard time toclimb the hill我想知道开头为什么用having been?其他形式的非谓语为什么不可以? 非谓语动词练习 （ ）1 The old man,______abroad for twenty years,is on the way back to his motherland.A to work B to have worked C working D having worked2 Having been ill in bed for nearly a month,he had a hard time____exam.A padd B to pass 因为不能这样说,he has been having a ill in the hospital for a week,但又想用语法体现出一直持续的状态 Having been ill for a month,Tim has lots of lessonsA.made up B.making upC.make up D.to make up All the exam papers _______ ,the teacher sent the class home.A.having been handed in B.having hands in C.handing in D.being handed in The temple ( )in the1970s has been deserted.A.being built B.builtc.building D.having been built having been ill for two weeks,she felt rather weak...这里用felt还是feel All examination paper____,the teacher let the students leave.A.handing in B.having handed inC.to be handed in D.having been handed in ______ many times,none of the boys dared swim in that river______ many times,none of the boys dared swim in that river.A.Having warned B.Been warned C.Having warning D.Having been warned has been ill in bed ____ three days .A.in these B.in those C.these D.those为什么不可以选B？