I paid a fine of 200yuan for speeding. If only I the traffic rules!
A. had respected
B. respected
C. would have respected
D. could respect
网友回答
(答案→)A. had respected
B. respected
C. would have respected
D. could respect
解析：对过去情况的虚拟，条件句中用过去完成时，主句用“would/should/might/could + have + 过去分词”，故选A。