Question

_____ your advice, I would have had no trouble with my papers. A．Had I followed B．If I foll.

_____ your advice, I would have had no trouble with my papers. A．Had I followed B．If I followed C．If I have followed D．Once I followed

Answer 1

A
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。故答案为A。