题目内容
他的门钥匙掉在地上，但他没有意识到。
His key ________ the door ________ ________ the ground, but he didn't know it.
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题目内容
他的门钥匙掉在地上，但他没有意识到。
His key ________ the door ________ ________ the ground, but he didn't know it.