关于being donethe problem which is being discussed is important.这句话中的being是起到什么作用?定语是个什么结构?为什么定语里有两个be?

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关于being done
the problem which is being discussed is important.
这句话中的being是起到什么作用?定语是个什么结构?
为什么定语里有两个be?

is being done是被动语态的现在进行时形式,意思是正在被做.which is being discussed是定语从句,修饰the problem.
  The problem which is being discussed is important.
  翻译:正在被讨论的哪个问题非常重要.

which is being discussed 做he problem的定语,整句话是the problemis important.