单选题Unfortunately  it was in&

问题补充：

单选题Unfortunately,itwasinYushuCounty,______a7.1-magnitudeearthquakehappenedonApril14,,______alargenumberofstudentswereburiedinsidedamagedschools.A.which; whenB.that; thatC.where; thatD.where; which

答案：

C