翻译句子：你知道你父母昨天晚上7点在客厅做什么吗？ 翻成：Do you know what your parents were doing at 7pm in the living room yesterday? 和：Do you know what your parents were doing in the living room at 7pm ysterday? 哪一个正确？为什么？

后一句好

那么前一句有没有错误呢？