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By the time I saw the angry expression on his face,I ______

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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?
By the time I saw the angry expression on his face,I ______
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.