问题
选择题
The reason _______ he explained for his being late was ________ his alarm clock didn’t work.
A．why; because
B．that; because
C．/; that
D．for which; that
答案
答案：C
第一空为定语从句先行词是The reason关系词要在从句中做explained的宾语所以要用关系代词which\that还可省略；第二空考查表语从句不缺成分用连接词that，所以答案为C