问题描述：
____for your help,we wouldn't have succeeded.
A,Hadn't it been B,Had it not been C,If it had been D,If it were
但是A和B的区别在哪儿?
A,Hadn't it been B,Had it not been C,If it had been D,If it were
但是A和B的区别在哪儿?
问题解答：
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