◎ 题干
---Do you know ______ after Japanese earthquake and tsunami(海啸)?     
--- Sure. For three weeks.
A.when did the dog float(漂浮) on the sea
B.when the dog floated on the sea
C.how long did the dog float on the sea
D.how long the dog floated on the sea
◎ 答案
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◎ 解析
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◎ 知识点
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