问题补充：
— Were you worried about him last night? — Yes. It was .
A. until he returned that I went to bed
B. until be returned that l slept well
C. not until he returned that I went to bed
D. not until did he return that I went to sleep
答案：
A. until he returned that I went to bed
B. until be returned that l slept well
(答案→)C. not until he returned that I went to bed
D. not until did he return that I went to sleep
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