虚拟语气的用法＿ for your encouragement,I’d never have invented this

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虚拟语气的用法
＿ for your encouragement,I’d never have invented this machine.
A.Had it not B.If it were not C.If I had not been D.Had it not been
可我不知道为什么会出现it,是什么含义,我想选C为什么不对呢

我觉得这道题可以还原一下：(变成强调句)
It was for your encouragement that I invented this machine,强调句强调部分为for your encouragement.对此句话进行虚拟,即对过去时进行虚拟,“如果不是因为你的鼓励我不会发明这个机器.”即“If it had not been for your encouragement,I'd never invented this machine”.省略if ,将had提前,整句变为：Had it not been for your encouragement,I'd never have invented this machine.所以答案为D.C选项的句子结构还原就是不正确的
不知这样解释你懂不懂.

一道英语虚拟语气的题－－for the reservior(蓄水池),we'd never have been beat what if的用法这里是不是跟虚拟语气就要用过去式?For example What if I have/had on 虚拟语气would have done 的用法 but...for的虚拟语气用法虚拟语气：______,surely I would never have believed 虚拟语气的用法有must have been的用法么?虚拟语气里面? 关于虚拟语气but for含蓄条件句的用法虚拟语气的具体用法初中英语虚拟语气的用法? 虚拟语气的各种用法 suppose的虚拟语气用法