这里省略了一个if
可以先改为肯定句看：if it had been possible,you wouldn't have helped him.
这样看,它是一个典型的对过去的虚拟：从句用 过去完成时,主句用would+现在完成时
（Wouldn't you have helped） him （had it been） possible?括号处何解?
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