__________him not to do so, he wouldn’t have made such a serious mistake.
A．Did I persuadeB．If I persuadeC．If I should persuadeD．Had I persuaded
D

試題分析：句意：如果我說服他不這么做，他就不會(huì)犯這么嚴(yán)重的錯(cuò)誤了。從主句he wouldn’t have made such a serious mistake.可知這是和過去相反的虛擬語氣，條件句應(yīng)該是：If I had persuaded him not to do so…，這種條件句，可以省略if提前had，所以選D。
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