英语语法问题If only I could have helped you!But I really _____ no

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英语语法问题
If only I could have helped you!But I really _____ no good idea how.
A.have
B.had
C.have had
D.had had
为什么不能选C?

If only 是一种表示愿望的惯用说法,意思是“要是…那该多好”或“但愿…就好了”,因此前面的感叹句是虚拟语气,其中谓语动词用的是对过去虚拟的 could have helped,意思是“我要是当时能帮你那该多好啊”.
由于感叹句中的虚拟时态已经确定了时间的大前提是发生在过去,后面所说的“我真的不知道如何帮你”当然也是指过去的那个时间,因此要用过去时 had.
have had no good idea 指的是到现在也不知道,与上文所表示的时间没有关系.

If I had known that,I could have helped you.had和known怎么都是过去式 I HAVE NOT REAIIL KNOW YOU!BUT I THINK I AM A REALLY FOOL!NO 求挑英语语法错误I don't know why,but it's really happens.I have no i I have no still loved her,i will leave you if I really love I want nobody nobody But You only if i have you,i'll be happ I will give you happily _____ you ask for only if I have.—I 英语翻译I could be so good at loving you,but only if you told me i hate to say so ,but really i have no time to go with you But that you helped me,I wouldn’t have succeeded. I have no hands and arms,But only legs and feet.I’m with you if i could have you back If I Could Have You Back 歌词