____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?

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____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?

____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?
____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?

____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?
我来试试:
A = Hadn't it been = Had not it been,不符合虚拟语气的倒装句结构.
B = Had it not been (虚拟语气的倒装句=If it had not been)