Question

句子成分分析The reason why he was late was that he had taken a wrong bus

Answer 1

c
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。