Since her blood pressure is much higher than it should be,her do

Since her blood pressure is much higher than it should be,her doctor insists that she ______ smoke.
A、will not smoke
B、should not smoke
C、not smoke
D、Both B and
【正确答案】：D
【题目解析】：虚拟语气。insist后应该接虚拟语气，should+动词原形，或 will +动词原形。