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……and that's what I was doing when Charlie came home.此处’s是is还是was?was可以缩写为’s吗?

分类: 作业答案 • 2021-12-19 11:45:35

问题描述：

……and that's what I was doing when Charlie came home.此处’s是is还是was?was可以缩写为’s吗?

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