◎ 题干
 _____ 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
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“_____ 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 wai…”主要考查了你对  【现在分词的完成式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。