改错 He could be able to skate when he was seven years old

改错 He could be able to skate when he was seven years old can could be able to Could you please tell me if he ___finish the work on time A.could B.was able to C.is able to D.would be able to ,为什么? They could't be able to climb to the top of mountain,It was so high.改错 be able to、can、could的区别 could和be able to的区别 单项选择 He'll ----- speak Japanese in a few months.A.can B.could C.be able D.be able to Pheidippides ran as fast as he ( )to Athens.A.can B.could C.possible D.be able to If Mike ___his homework ,he would have come to class.A is able to finish B would be able to finish C could finish D had been able to finish She won't be able see the card.改错 be able to 和could/can 有什么分别 can,could和be able to的区别 He was working hard at English so that he ______ make progress in his EnglishA.was able to B.could 为什么A不选,经过努力获得成功用be able to 不是更好吗 He ____ the test,but he wasn't careful enoughA.could have passed B.were able to passC.must have passed D.might be able to pass为什么选A? byrd know that he would be able to reach the South Pole which was 300miles away这里的be able to 可以换成could吗 如果不能为什么 The river is very wide.None of us ( ) swim across it .A.can B.could C.be able to D.able toWhen the boat sank,he ( )swim to the bank.A.can B.could C.was able to D.is able to He said he could't listen to me.改错 can/could和be able to在这两个句子里的区别,为什么不能替换为什么 after a lot of studying,he was able to pass the exam 和 despite the bad weather,the climber were able to reach the top by noon这两个句子里的be able to不能