摘要： him not to do so, he wouldn’t have made such a serious mistake. A. Did I persuade B. If I persuade C. If I should persuade D. Had I persuade 答案D. 解析:题干中主句的谓语动词使用了wouldn’t have made. 说明该动作表示与过去事实相反.故条件句使用表示与过去事实相反的虚拟结构if sb. had+过去分词.或使用 had sb. done 即省略了if的虚拟结构.
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