◎ 题干
All that can be done _____.
[     ]
a. has done
b. has been done
c. have done
d. have been done
◎ 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“All that can be done _____. [ ]a. has done b. has been done c. have doned. have been done …”主要考查了你对  【被动语态】【现在完成时】【主谓一致】  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。