题目内容

 It was not until mid-night ________ he went back home after the experiment. 

A. when                                                                 B. /

C. that                                                             D. before

【解析】选C。考查强调句型。句意:直到半夜他才做完实验回家。“not. . . until”的强调结构为:It is/was not until. . . that. . . 。故正确选项为C。

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