Question

By the time I saw the angry expression on his fa

By the time I saw the angry expression on his face, I ______ exactly what I was having to face. But not for a moment ______ I should quit.
A. had known; I thought
B. have known; had I thought
C. would know; I would think
D. knew; did I think
这题选D 为什么不能选B呢？

Answer 1

But not for a moment __句否定词not在句首,后面的内容要用倒装句语序。排除A\C
根据前面的时态I saw，可知第一空用过去时态，可能是一般过去或过去完成，排除B，B用的是现在完成。