--It's $500, but that is my last offer.
--OK, it is a ______.

2023-05-26

A. cost
B. price
C. reward
D. deal

参考答案:C

I have to go是定语从句,先行词是the reason,因此引导词用why,表示原因,排除D项。 my mother is ill in bed是表语从句,说明主语the reason是什么,表示一个事实而不是原因。that在引导的表语从句中 充当连词的作用,没有实际意义,不作句子成分,故选C。