题目内容
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
解析试题分析：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。
考点：考查名词性从句
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