2. 职称英语
  3. 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  52
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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