so little (did i know) about this theory that the lecture was totally beyond me.为何 (did i know) 不用（had i known）?

so little (did i know) about this theory that the lecture was totally beyond me.为何 (did i know) 不用（had i known）?
so little (did i know) about this theory that the lecture was totally beyond me.
为何 (did i know) 不用（had i known）?

so little (did i know) about this theory that the lecture was totally beyond me.为何 (did i know) 不用（had i known）?
过去完成时必须表示“过去的过去”,也就是要在另一过去动作之前发生或者在一个过去的时间状语之前发生.不能单独使用.在这个句子里knew并不是在另外一个动词was 之前发生的,而是同时发生的.
这个倒装句正常语序是:
I knew so little about this theory that the lecture was totally beyond me.我对这里理论了解如此之少以至于我完全不能听懂这个演讲.
加油!好问就能学好!

主句是一般过去式，所以用did i know)。the lecture was totally beyond me.

对这一理论我知之甚少，所以这个讲演我完全听不懂。