2分)______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home. A. To wait B. Have waited C. Having waited D. To have waited

2分)______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.

A. To wait
B. Have waited
C. Having waited
D. To have waited

出自：兰州财经大学大学英语

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