题目内容：

09年全国卷英语完型填空句子分析
I’ve discovered I possess a large number of different talents (才能) and skills that I never would have thought were within me had it not been for my being open to trying new opportunities.
请解释had it not been for my being open to trying new opportunities.中的had是怎么回事情

优质解答

这是一个省略句 虚拟语气中if省略 助动词had提前 成为倒装句式 建议你看一看虚拟语气的知识