The headmaster demanded all the teachers in the office.
A. mustn’t smoke
B. did smoke
C. should smoke
D. not smoke
网友回答
A. mustn’t smoke
B. did smoke
C. should smoke
(答案→)D. not smoke
解析：考查虚拟语气：句意：校长要求所有的老师不要在办公室抽烟。根据句意排除BC，主句的谓语是demand，从句的谓语用虚拟语气，用should+动词原形，should可以省略，选D。