20. I just don't understand    that leads to so many teenagers becoming so addicted to the Internet.

A. why it does     B.  what does it

C. what it is      D.   what is it

20.   C考查強調(diào)句。句意：我就是不明白是什么導(dǎo)致如此多的青少年沉迷于互聯(lián)網(wǎng)。句中understand之后的賓語從句部分為強調(diào)句的特殊疑問結(jié)構(gòu)，強調(diào)句子的主語，故要用"what is it that..."，但受賓語從句的語序影響，要將該強調(diào)句變成陳述語序，由此可知，答案為C。

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練11特殊句式綜合訓(xùn)練

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