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    in the queue for half an hour.the old man suddenly realized he had left the cheque in the car. A.Waiting B.To wait C.Having waited D.To have waited 答案 C 解析 逗号前的部分是时间状语.不定式一般不作时间状语.首先排除B.D两项,wait的动作在realize之前.故用分词的完成式. 【查看更多】

     

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