______ in the queue for half an hour, Tom suddenly realized that he had left his

游客2024-07-27  14

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

选项 A、To wait
B、Waiting
C、Having waited
D、To have waited

答案 C

解析 此句应该用分词短语的完成形式表示在主句谓语动词之前发生的动作。
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