问题补充:
The reason he was absent was he was ill and unable to go to school.
A. which; that
B. why; because
C. which; because
D. why; that
答案:
A. which; that
B. why; because
C. which; because
(答案→)D. why; that
解析:第一空the reason是先行词,在定语从句he was absent中作原因状语,故用why;第二空是表语从句,陈述原因的内容,而且表语从句是一个完整的句子,故用that,其不作成分,没有意思,只起连接作用。句意:他缺席的原因是他病了,不能上学了。