题目内容
__ at the airport for half an hour, the absent-minded professor suddenly realized he had left the ticket in the hotel.
A.Waiting B.To wait C.Having waited D.To have waited
C
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题目内容
__ at the airport for half an hour, the absent-minded professor suddenly realized he had left the ticket in the hotel.
A.Waiting B.To wait C.Having waited D.To have waited
C