问题标题:
【—WhendidtheterribleearthquakeinLushanhappen?—Ithappened________themorningofApril20,2013.A.inB.atC.on】
问题描述:

—WhendidtheterribleearthquakeinLushanhappen?
—Ithappened________themorningofApril20,2013.
A.in                 B.at                C.on     

梁伟文回答:
  C   
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