Tim will be the last to leave the office so he must make sure________all the lights and computers will be turned off.

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问题 Tim will be the last to leave the office so he must make sure________all the lights and computers will be turned off.

选项 A、unless
B、which
C、when
D、that

答案D

解析 分析句子结构可知,空处引导一个宾语从句。从句成分和意义完整,所以应用在从句中不作任何语法成分,只起连接作用且无词义的that引导。unless:除非,如果不,引导条件状语从句,不能引导名词性从句;which:哪一个,哪一些,在宾语从句中作主语、宾语等成分,且有选择含义;when:何时,在宾语从句中作时间状语,这三项均不符合题意。故选D。
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