Marry is not a diligent girl,for it is the forth time that she has been sleep in class,__?

Marry is not a diligent girl,for it is the forth time that she has been sleep in class,__?

题目
Marry is not a diligent girl,for it is the forth time that she has been sleep in class,__?
a isn't she
b isn;t it
c hasn't she
d hasn't it
要说原因
答案
isn;t it
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