[单选题]I remembered that the air conditioners _____ turned off before I left home.

A
were
B
were to be
C
had been
D
have been
正确答案:C
题目解析
考查动词的时态。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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