The doctor said that the patient would die___he was sent to hospital im-mediatelyA except B unless为什么选B

The doctor said that the patient would die___he was sent to hospital im-mediatelyA except B unless为什么选B
The doctor said that the patient would die___he was sent to hospital im-mediately
A except B unless
为什么选B

The doctor said that the patient would die___he was sent to hospital im-mediatelyA except B unless为什么选B
except虽然中文翻译过来是除了的意思,但这个除了是真正的除去,而不是unless的除非

除非
典型句 记住

条件状语从句
except 作动词是[除了]的意思 并且后面不跟句子
unless是除非 引出条件状语从句

3F正解，except不能引导条件状语从句。except是介词，后边跟名词性的词。
unless引导条件状语从句，译为“如果...不”相当于if not。