He insisted that she__________improve her oral English by doing

He insisted that she__________improve her oral English by doing a lot of practice.
A、could
B、would
C、might
D、should
【正确答案】：D
【题目解析】：【考试点拨】考查虚拟语气【应试指导】句意：他坚持认为她应该通过大量练习来提高口语：insist后的宾语从句中的谓语应用虚拟语气，即“should+动词原形”，should也可省略。