12. It is a difficult problem for high school students    they can properly use the Internet.

A. what       B. where

C. when       D. whether

12.   D考查主語從句的連接詞。句意：對于高中生來說，他們是否能正確地利用網(wǎng)絡是一個很難的問題。句子中it是形式主語，真正主語是whether引導的主語從句，根據(jù)句意選D項。

題目來源：2015全品語法快練高中英語新課標 > 訓練4從句綜合訓練

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