Not until World War II to use new chemical techniques to purify penicillin.
A. they managed
B. that they managed
C. did they manage
D. they didn’t manage
网友回答
A. they managed
B. that they managed
(答案→)C. did they manage
D. they didn’t manage
解析：考察倒装句。当否定词或者半否定词放在句首的时候，后面的主句使用部分倒装的形式。本题的Not until World War II是否定词引导的时间状语从句放在了句首，后面使用部分倒装的形式。故C正确。