强调句还是定语从句的疑问

I want to know what that is you are playing.

请问这句话该怎么分析，为什么？以下是我目前的想法：

1)是强调句，在is后省略了that。

2)不是强调句，what是is的表语，you are playing为what的定语。

I want to know what that is you are playing.

黑体部分还原成特殊疑问句则为：

What is that (which) you are doing?

that为指示代词作主语，定语从句是修饰that的。

曹荣禄 -

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