they are all taken good care

Question

The nurse won't leave her patients she's sure they are all taken good care of．（　　）

A. unless

B. because

C. since

D. if

Answer 1

答案：A
观察句子的结构结合选项可知空处缺少连词的连接；根据前后句的时态主句为一般现在时，从句为一般现在时，符合条件状语从句的用法；结合前后句的意义：主句为The nurse won't leave her patients （这个护士不会离开她的病人）从句为she's sure they are all taken good care of（她相信他们都得到了很好的照顾）可知后句是前句的否定条件句意才连贯，结合选项，unless是从属连词，引导条件状语从句，含有否定意义，相当于if条件状语从句的否定形式．所以unless=if not，所以此句也可理解为"如果护士不相信病人得到很好的照顾，就不会离开她的病人"．所以用unless表除非，如果不．故选：A