It was several years I realized David had lied to me.
A. when; that
B. that; when
C. before; that
D. until; why
网友回答
A. when; that
B. that; when
(答案→)C. before; that
D. until; why
解析：C 句意：过了几年我才意识到大卫向我撒了谎。It is/was＋一段时间＋before...表示“过了多长时间才……”；第二空，realized后的从句不缺成分，故用that引导。