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过去完成时变一般疑问句,怎么变

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过去完成时变一般疑问句,怎么变
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将had提前,再加一般疑问句语序,如:When I arrived at the station, the train had already left 当我到达火车站时,火车已经开走了一般疑问句:When I arrived at the station, had the train already left ? ...