__your support,we might have succeeded in performing the last .

问题描述:

__your support,we might have succeeded in performing the last .
A.If we have B.If we would have had C.If we had D.Had we had

D
原句为虚拟语气的倒装.
恢复为:“If we had had your support,we might have succeeded in performing at last.”就可以理解了.