_happened to be no one in the building when the fire broke out.A It B There C That D this选什么 为甚么

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_happenedtobenooneinthebuildingwhenthefirebrokeout.AItBThereCThatDthis选什么为甚么_happenedtobenooneintheb

_happened to be no one in the building when the fire broke out.A It B There C That D this选什么 为甚么
_happened to be no one in the building when the fire broke out.A It B There C That D this
选什么 为甚么

_happened to be no one in the building when the fire broke out.A It B There C That D this选什么 为甚么
B
there be句型