问题补充：
--- I have great difficulty figuring out the answer to this problem.
--- my advice, you less difficulty with such problems.
A. If you had followed, would have had
B. If you followed, would have
C. If you had followed, would have
D. If you listen, will have
答案：
A. If you had followed, would have had
B. If you followed, would have
C. If you had followed, would have
D. If you listen, will have
解析：
这是一个混合型的虚拟语气。主句与从句的动作发生在不同的时间，这时主，从句谓语动词的虚拟语气形式因时间不同而不同，从句与过去事实相反的假设，而主句是与现在事实相反的假设。说话者现在解决问题有困难，是因为（过去）没有听从建议。
