I supported him in time,otherwise he would have fallen off t

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I supported him in time,otherwise he would have fallen off the brink.
A might fall B would fall C would have fallen D should have fallen
为什么不选B?从句是一般过去式,主句应用would+原形,

这是虚拟语气的用法.对过去的动作的虚拟用 would have done的形式.本句子叙述的是过去的事.所以用C would have fallen
再问：请问什么时候用would have done？就是当从句是过去完成时，主句就用would have done，对吗？可这句子I supported....是一般过去式，不是过去完成时，所以应用would +原形. 我的想法不对吗？
再答：你说的不对，前后没有必然的联系。各个句子的谓语动词形式看实际情况。 I supported him in time, otherwise he would have fallen off the brink. =If I hadn't supported him in time, he would have fallen off the brink. 【注意】在虚拟的条件句中，动作发生在过去就用had done的形式，而结果句（主句）如果是发生在过去就用would have done形式，本句就是这样。要不是（那时）我支撑他，他（那时）就会滑落掉，主句从句都是过去所以都有完成式。

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