Not until three years ago____ to work outside.
A. he began
B. he begins
C. began he
D. did he begin
参考译文：直到三年前他才开始外出工作。
【解析】本题是语序结构题。not until放在句首的否定状语从句，此时主句要求倒装语序。应将助动词did提前。
具有(半)否定意义的词或短语位于句首时，用部分倒装。如：seldom, rarely, not, never, by no means, in no time, hardly...when, no sooner...than, not only...but also等。
如： Not only does he do well in his lessons, but also he often helps others with their lessons.