I just don’t understand ______ that leads to so many teenagers becoming addicted

题干

I just 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

上一题下一题 0.85难度单项选择更新时间:2010-04-12 05:22:33

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