Not until recently paid work outside the home.
A. most mothers in Britain took
B. did most mothers in Britain take
C. took most mothers in Britain
D. were most mothers in Britain taken
网友回答
A. most mothers in Britain took
(答案→)B. did most mothers in Britain take
C. took most mothers in Britain
D. were most mothers in Britain taken
解析：考查倒装句型。Not until放句首，应该用部分倒装，即把情态动词、助动词和be动词放到主语前。mothers和take是主动关系，故用主动。故选B。