— Were you worried about him last night?
— Yes. It was ________

1. A.
   until he returned that I went to bed
2. B.
   until be returned that l slept well
3. C.
   not until he returned that I went to bed
4. D.
   not until did he return that I went to sleep

— 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

— Were you worried about him last night?  — Yes. It was ________.

— Were you worried about him last night?  — Yes. It was ________.