The light was on all day long.I didn't know who ____.A.has turned it on B.had turned it on

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The light was on all day long.I didn't know who ____.A.has turned it on B.had turned it on

The light was on all day long.I didn't know who ____.A.has turned it on B.had turned it on
The light was on all day long.I didn't know who ____.A.has turned it on B.had turned it on

The light was on all day long.I didn't know who ____.A.has turned it on B.had turned it on
B
前句是一般过去时,这句为”过去的过去

选B。根据was 可以判断整个句子的时态是过去时。等开了一整天,而根据答案开灯这个动作肯定是在灯亮之前,所以后一句应该是过去的过去发生的事情,所以是had turned it on