题目

When I left, mother ___ me that I should take care of myself while I was in the countryside.  A. remembered B. reminded C. was reminded D. asked     答案：Bremind sb. sth.为固定搭配，意思是“提醒某人某事”。其它选项搭配和意义不符合要求。  已知，设，成立；，成立，如果“”为真，“”为假，求的取值范围.