I just don’t understand ______ that lead

问题选择题

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

答案

答案：C

考察强调句，强调句的特点是去掉it was that之后句子完整，该句强调的是what，去掉强调句后的句子是 I just don’t understand what leads to so many teenagers becoming addicted to playing computer games.