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

試題分析：考查虛擬語(yǔ)氣：句意：校長(zhǎng)要求所有的老師不要在辦公室抽煙。根據(jù)句意排除BC，主句的謂語(yǔ)是demand，從句的謂語(yǔ)用虛擬語(yǔ)氣，用should+動(dòng)詞原形，should可以省略，選D。
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