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

A．is happening
B．has happened
C．was happening
D．have happened
C
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科目：初中英語 來源：0109 期中題 題型：單選題

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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