Not once did the supervisor______during the staff dispute, hoping the employees involved would find a solution for themselves.

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问题 Not once did the supervisor______during the staff dispute, hoping the employees involved would find a solution for themselves.

选项 A、intervene
B、to intervene
C、intervening
D、intervened

答案A

解析这句话中的否定词Not被提到了句子最前面，主语与谓语采用了倒装。助动词do的过去式形式did出现在句子开头时，主语后面的动词应使用动词原形，故选(A)intervene。

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