题目内容：

I would't have succeeded___for his help then.
A.hadn't it been
B.were it not
C.had it been not
D.had it not been
谢.

优质解答

选D
虚拟语气的省略用法,
I would't have succeeded if it had not been for his help then.
省略掉if 之后
had it not been for.
切记 not 不可以出现在 had 的后面.