◎ 题干
They all looked at the man surprisedly. No one knew what ______.
[     ]
A.is happening
B.has happened
C.was happening
D.have happened
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“They all looked at the man surprisedly. No one knew what ______.[ ]A.is happening B.has happenedC.was happening D.have happened …”主要考查了你对  【过去进行时】  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。