I iust dont understandthat leads to so many teenagers becoming addicted to playing comput

I iust don't understand that leads to so many teenagers becoming addicted to playing computer games·
A．why it does B．what it does C．what it is D·why it is。

解析：这里宾语从句是强调句型的特殊疑问句形式，强调主语what, 原强调句为What is ti that leads to …,做understand 的宾语从句时，需要使用陈述语序，故选C

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