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had been doing是什么时态？
What had he been doing？（不耐烦）had been doing这是 过去完成进行时 ；表示从过去的某一个时间点开始做某事一直持...
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had doing是什么时态
这句话里，had playing 是什么时态啊?貌似过去进行时应该是BE+进行式吧?这是一道单选题，答案是这个 ，另外的选项是:1play 2to play 3played 恐怕是您的断句有问题。 we had是定语从句 ，省略了宾语that。这...
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had been doing 是什么时态？
had been doing 是英语中的过去完成进行时态，一种相对复杂但实用的时态。时态系统在英语中极为丰富，其中许多并不直接使用，而是在间接引语或虚拟语气中发挥作用。过去完成进行时就是这样一种情况，它描述的是相对于过去某个时间点...
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have had doing是什么时态
构成完成时态，例： He has left for London.他已去了伦敦。 By the end of last month， they had finished half of their work. 1）have +过去分词，构成完成时态，例： He has left for London.他已去了伦敦。 By the end of last month， they had finished half of their wor
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had been doing是什么时态？
What had he been doing？（不耐烦）本回答被网友采纳过去时弊铅：Sally had a dog.
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had doing是什么时态
这句话里,had playing 是什么时态啊?貌似过去进行时应该是BE+进行式吧?这是一道单选题,答案是这个,另外的选项是：1play 2to play 3played 恐怕是您的断句有问题.we had是定语从句 ,省略了宾语that.这个定语从句修饰的...
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have had been doing是什么时态
have had been doing是现在完成进行时态。have：vt.有;持有;占有;由…组成;显示出，带有(性质、特征)。had：v.有;持有;占有;
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have/has/had加been是什么时态
have/has/had加been是什么时态have/has been+名词，现在完成时态的主动语态have/has been+动词的过去分词（done)，现在完成时态的被动语态have/has been+动词的现在分词(doing)，现在完成进
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had been doing 和 had done的区别
had done 是过去完成时,指发生在早于过去某个时间的行为,该行为到那个时间业已结束.had been doing 是过去完成进行时,同样指发生在早于过去某个时间的行为,但这个行为到那个过去时间还在进行.例如：By He had done the work by ...
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had doing是什么时态
1）have +过去分词，构成完成时态，例：He has left for London.他已去了伦敦。By the end of last month， they had finished half of their work.上月末为止，他们已经完成工作的一半。2）h...
had加doing是什么时态
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