这里是名词性从句中的表语从句.名词性从句从语法上相当于一个名词(短语),换成宾语从句你就能容易理解,但一变成主语从句/表语从句/同位语从句,很多人就出现理解困难.就象 I don't know where you live.很简单的,你就把where翻译成"....的地方"就行了.再比如:I don't know what you said.中的what翻译为"...的东西/事情"一样啊.换成主语从句再体会一下: Where you live is unknown to me.What you said made me confused.最后我们看看表语从句: The key is what you have said.关键是你说过什么东西?That is where the best job are.那就是好工作所存在的地方.记住下面几句话:名词性从句是个名词,是由引导词+称述句构成.引导词如果在从句中不充当成分,就用that;是"是否"之意,就用if/whether;而为特殊疑问词时,它在从句中必须充当一定的成分,缺什么成分就填上什么疑问词.题中the best jobs are的确在are后缺少where这个疑问副词做表语啊(where=介词+某地)!

最后再举几个例子: This is what I want to know.

The problem is when you will be free.

The key is how you can finish the work.

The answer is that you are fooled.

The trouble is whether you can solve the problem.

The city is where you can find good jobs.