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请问they have been able to do的时态是什么?been able to 和 be able to的

来源：学生作业帮 编辑：搜狗做题网作业帮 分类：英语作业 时间：2024/04/29 12:52:48
请问they have been able to do的时态是什么?been able to 和 be able to的区别是什么?
请问they have been able to do的时态是什么?been able to 和 be able to的
现在完成时 have been able to 是 be able to 的现在完成时
be able to 是什么时态 would be able to和be able to的区别 be able to 和will be able to 的区别 be able to 和 able to的区别 be able to do sth be able to do sth 的同义词是什么? be able to的be是什么词 be able to 的用法 be able to的同义词 be able to的词性 be able to的用法 be able to 的短语 be able to 的同义词组是什么?