It is a difficult problem for high school students they can properly use th
题型：不详难度：来源：
It is a difficult problem for high school students they can properly use the Internet．| A．what | B．where | C．when | D．whether |
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答案
| D |
解析
试题分析：考查主语从句。句意：对于高中生来说，他们是否能正确的利用网络是一件很难的问题。句子中it 是形式主语，真正主语是whether引导的主语从句，根据句意得出选D项。
考点 : 考查主语从句 |
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