问题补充:
单选题_____youradvice,Iwouldhavehadnotroublewithmypapers.A.Had I followedB.If I followedC.If I have followedD.Once I followed
答案:
A解析根据would have had可知, 这是是一个表示与过去事实相反的假设。if条件从句用过去完成时had done,又知if条件句中如有were, should, had,可以省去if,并使用倒装语序, 即were, should, had+主语+谓语动词。故