题目内容
The reason ____he was late was ____he had taken a wrong bus.
| A．why; because | B．for; because | C．why; that | D．for; that |
C
解析试题分析：考查定语从句和表语从句。本题使用的是固定句型The reason why...is that...“......的原因是......”。从句he was late不缺成分，先行词是the reason，因此，定语从句用why引导，for不能引导定语从句，排除B、D；was后跟从句作表语，从句he had taken a wrong bus是主谓宾结构，不缺成分，用that只起引导作用，排除A；故选C。
考点：考查定语从句和表语从句
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