if he _____ the doctor's advice ,he wouldn't have been in su

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if he _____ the doctor's advice ,he wouldn't have been in such poor health.
A)followed
B)has followed
C)was following
D)had followed
请问答案为什么选D,可以回答的详细一些么,可以写出if在各种情况下的用法么,谢谢~

对过去的虚拟,固定搭配,从句if had done, 主句 would have done
意为：如果他之前听从医生的建议,现在身体状况就不会这么糟糕.
再问：您好，请问在现在，将来的情况下if怎么用啊，谢谢了~
再答：与现在事实相反: 从句: 动词的过去式（be的过去式一般用were）主句:would/ should/ could/ might + 动词原形与过去事实相反 : 从句 :had + 过去分词主句 :would/ should/ could/ might + have + 过去分词与将来事实相反 : 从句:动词过去式，should + 动词原形，主句 :were to + 动词原形 would/ should/ could/ might + 动词原形

if he ______ my advice,he wouldn?t have lost his job.[ 一道高中英语选择If he ( ) my advice,he wouldn't have lost his job.A. If he _ my advice,he wouldn't have lost his job He wouldn’t have been saved even if he ____ to hospital at o 英语单选If he my advice,he wouldn't have lost his job.A．followe He wouldn’t have been saved even if he___________(send) to h 翻译He wouldn't have been catch dead in a school uniform!谢谢填空：（ No,he hasn't been to work today.He's been to the doctor He wouldn't have been able to make ends meet. He will have no choice but to follow the doctor's advice 三道很纠结的高一英语Jack should have taken the doctor's advice that he He was in poverty at the time,______ he wouldn't have accept