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 thoughtB.have known; had I thoughtC.would know; I would thinkD.knew; did I think在线课程D
尽管句中有by the time引导的时间状语从句，但主句谓语所表示的动作不是发生在从句谓语所表示的动词之前，而是几乎同时发生，所以用一般过去时。by the time此处近乎于at the time之意。