——————for your help, we'd never have been able to finish the work. 选择题求解

——————for your help,we'd never have been able to finish the work.
A:It was not B:Had it not been
C:Hadn't it been D:If it had been not
请问这道题为设么选B,最好能帮忙分析一下,
答：B
译：要是没有你的帮助,我们决不可能完成这项工作.
析：最佳E：But (for) ...= If it had not been for.要不是因为.的话.
我们知道,虚拟条件句中如果有助动词had的话,可以通过部分倒装的方法省略if:
Had it not been for...=If it had not been for...
D选项纯粹是一个凑数的干扰项.A的错误更大,没有if,也没有倒装,更不能反映对过去情况的虚拟.AD很容易排除.最大的干扰项是C,因为,我们平时见过这样的句式：Haven't I told you before?我以前难道没有告诉过你吗?但这是两码事.语法书上,关于虚拟语气,没有见到过这样的例子.语言不是数学,不能凭空推理.碰到这样的题,还是乖乖地按语法书上说的去做吧.
C到底对不对,行不行,我不敢下结论.但我可以肯定地告诉,选C不得分.选B,能得分.
听雅哥,没错的.