All the lights ______ before we left the office.A、has been turned offB、have tur

游客2024-07-20 13

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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