had been doing 和had been done有什么差别?

had been doing 和had been done有什么差别 had been doing 和had been done有什么差别? had been doing 和 had done的区别 had been doing 是什么时态? had been doing是什么时态 had been doing是什么时态 had been doing是什么是时态? had been doing是主动还是被动 was doing、had been doing和had been done都有什么区别?was doing和had been doing不是都是指过去一段时间做的事情吗?他们俩有什么区别吗?had been doing 和 had been done 又有什么区别. 话说我在写英语句子时不 Had been telling和 Had told 求问had gone和had been 英语时态区分have done .have been doing.had done.had been doing.有什么区别. had been had been和had been to的区别 英语,has been和 had been have been doing,had been doing,will have been down是什么 had been looking forward后面加to do 还是doing? had been doing是什么语法?举个例子~有have/has been doing的说法吗?