问题
选择题
The reason _____ he explained is ___ she was ill.
A．that , that
B．which , that
C．why,because
D．why, that
答案
答案：A
考查定语从句和表语从句。第一空是定语从句，先行词为The reason，从句he explained后缺少宾语，所以用关系代词which/that，第二空是表语从句，that 无词义，起引导作用。所以选A。