问题描述：
I am sorry,but I—you were here.When did you come back?A don't know B didn't know 请选...
I am sorry,but I—you were here.When did you come back?
A don't know
B didn't know
请选择一个,
I am sorry,but I—you were here.When did you come back?
A don't know
B didn't know
请选择一个,
问题解答：
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