问题
选择题
— 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
C
此处强调句型，强调是until从句，如复原应为I didn't go to bed until he returned.这个句型变为强调句型应注意，主句中的not在强调句中移至until之前。