练习册

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    If the Watergate Incident Nixon would not have resigned from the presidency. A. did not occur B. had not occurred C. was not occurring D. be circling 解析:(B)had not occurred表示对过去的虚拟.条件句中要用过去完成式.主句中要用should+动词原形的过去分词. 【查看更多】

     

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    If the Watergate Incident__________Nixon would not have resigned from the presidency.?

    A.did not occur                                  B.had not occurred

    C.was not occurring                            D.be circling

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