单项选择题

The necessity for talking about "regrets" can be summarized as that regrets are very ______.

A. annoying for people
B. wonderful for people
C. common to people
D. puzzling to people

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单项选择题

The necessity for talking about "regrets" can be summarized as that regrets are very ______. 您的浏览器不支持 audio 元素。