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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

试题分析:考查名词性从句。表语从句中不缺少任何成分,故用关系词that。The reason why … is/was …,……的原因是……。句意:他们考试不及格的原因是他们前一天晚上根本没睡觉。根据句意说明C正确。
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