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having spent some time in the city...求高手解释这是什么时态吖?have用现在分词,spent是过去分词.

分类: 作业答案 • 2022-06-08 21:43:43

问题描述：

having spent some time in the city...求高手解释这是什么时态吖?have用现在分词,spent是过去分词.

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