2. 外语
  3. Not a sound ______ while the professor was giving a speech.

Not a sound ______ while the professor was giving a speech.

admin2008-11-13  32
问题 Not a sound ______ while the professor was giving a speech.
选项 A、the students utter
B、the students uttered
C、did the students uttered
D、did the students utter
答案D
解析 倒装结构。当否定词not位于句首时，句子采用倒装结构，谓语动词的助动词提前。
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