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。
　C
這里賓語從句是強調(diào)句型的特殊疑問句形式，強調(diào)主語what, 原強調(diào)句為What is ti that leads to …,做understand 的賓語從句時，需要使用陳述語序，故選C
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