问题描述：
但我不懂.....
--mary,why are you late again?
--i'm sorry.My motorbike on the way here
A is broken B was broken C has broken
--mary,why are you late again?
--i'm sorry.My motorbike on the way here
--mary,why are you late again?
--i'm sorry.My motorbike on the way here
A is broken B was broken C has broken
--mary,why are you late again?
--i'm sorry.My motorbike on the way here
问题解答：
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