had been doing的意思|示意

过去完成进行时 ... 过去完成时 had done 过去完成进行时 had been doing 一般将来时 will do ...

行时 (十一) 过去完成进行时 （had been doing ）: 表示过去某时间之前一直进行的动作。 It had been raining for two days.

过去完成进行体 ... 现在完成进行体 has been doing 过去完成进行体 had been doing 一般形式 (to) do (to) be done ...

过去一直 您正在查看 "学习空间" 分类下的文章 ... There is no reason why （先因后果） There is no reason because （先果后因） had been doing 过去一直…… ...