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过去进行时可以表示在过去某个时间点发生的事情。 时间点可以用介词短语、副词或从句来表示。例如： What was she doing at nine o'clock yesterday? 昨天晚上九点她在做什么? (介词短语表示时间点) She was doing her homework then. 那个时候她正在写作业。(副词表示时间点) When I saw him he was decorating his room. 当我看见他的时候他正在装饰房间。 (when从句表示时间点) (责任编辑：admin) |