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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

题目详情
___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
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答案和解析
这个题正确答案应该是C,
句子意思翻译如下:
老人排队等候了半个小时,突然意识到他把支票忘在了车里.