_____, they did not know that it is a very serious matter to wake up guests at early hours.
考试：军队文职人员招聘
科目：英语言文学 (军队文职)（在线考试）
问题：
A：Unimportantly
B：Unfortunately
C：Unassumingly
D：Unimaginably
答案：
解析：
相关标签：
_____, they did not know that it is a very serious matter to wake up guests at early hours.
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