练习册

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    情态动词+行为动词完成进行式(即情态动词+ have been + v-ing 形式).表示推测或评论过去某动作是否正在进行或一直在进行.例如: 1)They should have been meeting to discuss the problem. 2)He may / might have been buying stamps in the post office when you saw him. 【查看更多】

     

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