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IntroIf I had know how nice the weather would be, I would have brought my bathing suit. In this lec...
2009-10-02
谓语动词构成:I/we/you/they had worked; he/she/it had worked(1) 表示过去某一时刻之前已经完成的动作,常与由by,before引导的时间状语连用We...