— 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
　　　C　
此處強調(diào)句型，強調(diào)是until從句，如復原應為I didn't go to bed until he returned.這個句型變?yōu)閺娬{(diào)句型應注意，主句中的not在強調(diào)句中移至until之前。
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