All the lights ______ before we left the office.

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问题 All the lights ______ before we left the office.

时态和语态

选项 A、has been turned off
B、have turned off
C、had been turned off
D、had turned off

答案C

解析此句中主句的动作在从句的动作之前，而从句的动作发生在过去，所以主句应该用过去完成时，因为all the lights和turn off之间是被动关系，所以应该用被动形式，故选C。

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大学英语三级B级

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