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It is a difficult problem for high school students      they can properly use the Internet．
A．whatB．whereC．whenD．whether
D               
             
試題分析：考查主語從句。句意：對(duì)于高中生來說，他們是否能正確的利用網(wǎng)絡(luò)是一件很難的問題。句子中it 是形式主語，真正主語是whether引導(dǎo)的主語從句，根據(jù)句意得出選D項(xiàng)。          
考點(diǎn) : 考查主語從句
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