had been doing 和had been done有什么差别
人气：456 ℃ 时间：2019-10-25 10:39:31
解答
1、首先要区分has been done与 had been done的区别：have/has been done 是现在完成时的被动语态.表示某事被做,.如：The problems have been solved.这些问题已经被解决了.had been done 则是过去的过去,是过去完成...
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