So little ( ) know about physics that the lecture was comple

So little ( ) know about physics that the lecture was completely beyond me
A I knew Bdid I know CI had known Dhad I known
我想问下为什么不能选D 由题目来看我可以认为我已经知道我对物理了解很少,之后对课程完全不能领会?可是为什么错?选B的话不就是因为我听不懂课程所以我对物理不能领会.