问个初级英语问题 if he had worked harder,he______

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问个初级英语问题 if he had worked harder,he______
A would succeed B had succeeded
C should succeed D would have succeeded 为什么选D 这是什么语法现象

这是一个“虚拟语气”.
当if引导的条件状语从句与实际情况不相符时,要用虚拟语气,具体为：
与现在的情况不符：
从句中用一般过去时/ be 动词用 were ; 主句中用 would / should / could / might + 动词原形
与过去的情况不符：
从句中用 had + done; 主句中用 would / should / could / might + have + done
与将来的情况不符：
从句中用一般过去时/ be 动词用 were 或 were to + 动词原形; 或 should + 动词原形 ; 主句中用 would / should / could / might + 动词原形

问个初级英语问题 if he had worked harder,he______ if she had worked harder,she_ if he had worked harder,he would have succeeded,这里为什么要用would 一道英语虚拟语气的题If I had worked harder at school,I___________in a If he had worked hard____. 问个初级英语语法问题! had he worked harder he ——the final examination A must have Had he worked harder,he（）the exams.A.must have got through If she had worked harder,she_____ A.would succeed B.would ha you -----have passed the exam if you had worked harder横线中应该填 If I had worked harder at school,I -----in a comfortable off 虚拟语气If she had worked harder,she would have succeeded这是过去完成时