◎ 题干
In order to find the missing child, villagers ________ all they can over the past five hours.
[     ]
A. did  
B. do  
C. had done  
D. have been doing
◎ 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 order to find the missing child, villagers ________ all they can over the past five hours.[ ]A. didB. doC. had doneD. have been doing…”主要考查了你对  【现在完成进行时】  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。