could 和was able to 的区别?
could 和was able to 的区别?
could和be able to的区别
could,was able,managed to,succeedin的区别
can,could和be able to的区别
could和was able to和manage to有什么区别?
be able to、can、could的区别
can/could和be able to在这两个句子里的区别,为什么不能替换
关于英语词组的用法be able to和could有什么区别?
be able to和could
用could或was able to填空.
would be able to和be able to的区别
be able to 和will be able to 的区别