It was not until Tom took off his dark glasses that I him.
A. recognized
B. knew
C. discovered
D. realized
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(答案→)A. recognized
B. knew
C. discovered
D. realized
解析：考查动词。A recognized辨认；B knew知道；C discovered发现；D realized意识到。句意：直到汤姆摘掉墨镜，我才认出他来。故A正确。