Not until he took off his dark glasses he was a famous film star.
A. had I found
B. did I find
C. I found
D. found I
网友回答
A. had I found
(答案→)B. did I find
C. I found
D. found I
解析：考查时态及主谓倒装，句意：直到他摘下他的墨镜时，我才发现他是一个著名的影星。Not until谓语句首时，主语采用部分倒装，助动词提前。结合语境可知主语描述的是过去某时的动作，助动词用一般过去时态。选B。