The reason why they failed the test was ____ they didn’t sleep at all the night before.
A．because B．why C．that D．for which
C

試題分析：考查名詞性從句。表語從句中不缺少任何成分，故用關(guān)系詞that。The reason why … is/was …,……的原因是……。句意：他們考試不及格的原因是他們前一天晚上根本沒睡覺。根據(jù)句意說明C正確。
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