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They all looked at the man surprisedly. No one knew what ______.

A.is happening
B.has happened
C.was happening
D.have happened
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科目:初中英语 来源:0109 期中题 题型:单选题

They all looked at the man surprisedly. No one knew what ______.
[     ]
A.is happening
B.has happened
C.was happening
D.have happened

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