关于not until的倒装用法
Last night,not until -----my homework -----.
B.I had finished ,did I go to bed
C.had I finished ,I didn't go to bed.
为什么选C?句子的意思是昨晚我做完作业才睡觉.问题是not until位于句首,主句倒装,从句不倒,这个句子为什么从句倒装了呢?还是答案给错了?