The reason he didn’t come is he was ill.A. why；thatB. that；whyC. why；becauseD. why；what

网友回答

A. why；that
B. that；why
C. why；because
D. why；what
解析：A
解析　第一空填入的词引导的是定语从句，修饰the reason，故用why；第二空是表语从句，从句中不缺少主要成分，故填that。