◎ 题干
The coal miners________in the coal mine for 10 hours before we came to their rescue.
[      ]
A. had trapped  
B. had been trapping
C. had been trapped  
D. would have been trapped
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据魔方格专家分析,试题“The coal miners________in the coal mine for 10 hours before we came to their rescue.[ ]A. had trappedB. had been trappingC. had been trappedD. would have be…”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。