◎ 题干
As he ________ in the river for five hours, the thief looked very pale and hopeless.
[       ]
A. trapped  
B. has been trapped
C. trapping  
D. had been trapped
◎ 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“As he ________ in the river for five hours, the thief looked very pale and hopeless. [ ]A. trappedB. has been trappedC. trappingD. had been trapped…”主要考查了你对  【过去完成时的被动语态】  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。