I remembered that the air conditioners______turned off before I left home.

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问题 I remembered that the air conditioners______turned off before I left home.

选项 A、were
B、were to be
C、had been
D、have been

答案C

解析 air conditioners与turn off之问是逻辑上的被动关系,所以应用被动语态。而且turn off的动作发生在left home之前,因此要用过去完成时的被动语态。故选C。
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