问题 选择题 The reason ________ he didn’t come is ________ he was ill. A.why;thatB.that;whyC.why;becauseD.why;what 答案 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。