题目内容
5. 昨天晚上可能是我们的老师关的灯。
It________ _________ our teacher who turned off the light last night.
5. could be
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题目内容
5. 昨天晚上可能是我们的老师关的灯。
It________ _________ our teacher who turned off the light last night.
5. could be