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