◎ 题干
We don't know what ______ to her.
[     ]
A. happen
B. was happened
C. is happened
D. has happened
◎ 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“We don't know what ______ to her. [ ]A. happenB. was happened C. is happened D. has happened …”主要考查了你对  【现在完成时】  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。