It was Tropical Storm Washi of Philippines on December 19 , 2011 caused the floods killed more than 684 people.A.when ; thatB.that ; whenC.when ; whenD.that ; that
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D解析考查强调句和定语从句。定语从句That caused the floods修饰先行词Tropical Storm。第二空that与it was构成强调句型的基本结构。