7．______him not to do so，he wouldn't have made such a serious mistake．（　�。�
A．If I persuadedB．Did I persuade
C．Had I persuadedD．If I should persuade

分析 如果我說服了他不要那么做的話，他就不會犯這么嚴(yán)重的錯誤了．

解答 答案：C
分析句意可知，本句是虛擬條件句；主句"he wouldn't have made such a serious mistake．他就不會犯這么嚴(yán)重的錯誤了"中的謂語部分使用了would（not）+have+done的形式，因此可知此處表達(dá)了與過去事實相反的情況，所以從句要用過去完成時；所以A．B．D都不正確；C．省略了連詞if，所以要提前had，即使用倒裝句．故選C

點評 本題考查了虛擬條件句的用法．首先要根據(jù)句意判斷該句是否是虛擬條件句；然后根據(jù)主句或從句的謂語部分的表現(xiàn)形式來判斷該句是與過去，現(xiàn)在還是將來事實相反的情況，從而選出正確的時態(tài)或表達(dá)形式；因此必須要熟練掌握虛擬條件句中關(guān)于時態(tài)對稱的用法．

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