All the lights ______ before we left the office.

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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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