---Do you know ______ after Japanese earthquake and tsunami（海啸）?--- Sure. For three weeks.A.when did the dog float(漂浮) on the seaB.when the dog floated on the seaC.how long did the dog float on the seaD.how long the dog floated on the sea
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D解析根据特殊疑问句作为宾语从句，要注意使用陈述句语序，故选D