So little______about physics that the lecture was completely beyond my understanding.A.I k

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So little______about physics that the lecture was completely beyond my understanding.

A.I knew

B.did I know

C.I had known

D.had I known

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。