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人们跑来跑去,显然发生了不寻常的事情。( )
·Peopleranbackandforth,obviously,somethingunusualhadhappened.
·Peoplewererunningbackandforth.Obviously,somethingunusualhadhappened.
·Peoplewererunningbackandforth.Obviously,somethingunusualhadbeenhappened.
·Peopleranbackandforth,obviously,somethingunusualhadbeenhappened.

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