has been doing与had been doing,这两个时态分别代表怎样的概念,表示怎样的动作发生,用于何种情况,请大家分别具体解释一下它们所用的场合
人气：235 ℃ 时间：2019-10-19 04:07:19
解答
has been doing表示动作到现在为止一直在做 I have been waiting for you for an hour. had been doing表示动作到过去某一时刻为止一直在做 I had been waiting for you for an hour until you finally reached.
