Countless divorced politicians would have been elected out of office years ago had they eventhought of a divorce, let alone gotten one.

　　译文：

　　在数年前，无数离婚的政治家只要有过离婚的念头就会落选，更不用说真的离婚了。

　　点睛：

　　had they even thought...是省略if的虚拟条件句，因此助动词had前嚣构成倒装。因为要表达对过去事实的假设，所以从句用了过去完成时，而主句的谓语部分则相应地采用了would have done的形式。

　　考点归纳：

　　和let相关的常见短语还有：

　　let go放手，松开

　　Let go! You’re hurting me.

　　松开手!你把我弄疼了。

　　let sb. alone不打扰某人

　　I'm tired-let me alone!

　　我累了，别打扰我!

　　let sth. go/pass对某事不计较

　　I know you didn't mean to hurt me, so I'll let it pass this time.

　　我知道你不是有意伤害我的，所以这次我对这件事就不计较了。