问题
选择题
---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
答案：D
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