The reason__she gave up teaching was her serious illness
5个回答

定语从句,她放弃教书的理由而同位语是解释说明这个理由的内容的,the reason= that 从句比较:the reason that he was ill made him fail the exam.这句话中the reason 不是说他生病的理由,而是说他生病就是原因.他考试不及格的原因是他生病了.这就叫同位语.再看一句:the reason why he was ill is that he was caught in the rain.这就是定语,他生病的理由就是淋雨了.the reason 和that 从句根本就不是一个意思.