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

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can could be able to be able to 和could/can 有什么分别 can,could和be able to的区别 be able to、can、could的区别 could和be able to的区别 can和be able to的区别 can和be able to 的区别 用can和be.able to填空 be able to和can的区别 比较can 和be able to can 和be able to 能连用么就是说 can be able to ... Only in this way can we be able to...这里 can 和 be able to be able to的用法be able to和can的区别和用法 英语中,can和be able to有和区别? They have already read an write填问号（can,could,be able to）适当形式 can 与be able to 的具体区别 和 用法 can 和be able to能连用吗 can 和 be able to 可以连用吗!