优优班--学霸训练营 > 题目详情
  • _____ in the queue for half an hour, the old man suddenly realized be had left the cheque in the car.

    A. Waiting
    B. To wait
    C. Having Waited
    D. To have waited
    【考点】现在分词的完成式
    【分析】请登陆后查看
    【解答】请登陆后查看
    难度：中等
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