问题
选择题
_____ 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
答案
答案：C
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_____ 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
答案：C