题目内容

The headmaster demanded all the teachers ______ in the office.
A．mustn’t smoke B．did smoke
C．should smokeD．not smoke
D

试题分析：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。
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