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 句意:我记得在离开家之前空调已经关上了。turn off的动作发生在left home之前,因此要用过去完成时态。
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