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职称英语
All the lights ______ before we left the office.A、has been turned offB、have tur
All the lights ______ before we left the office.A、has been turned offB、have tur
游客
2023-10-03
48
管理
问题
All the lights ______ before we left the office.
选项
A、has been turned off
B、have turned
C、had been turned off
D、had turned off
答案
C
解析
主句的动作发生在从句的动作之前,表示过去某时刻前发生的动作,即“过去的过去”,所以要用过去完成时;主谓之间是被动关系,所以应用被动语态。
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