校园口语习语大全O-4:on earth 到底（mp3和文本下载)

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O-4:on earth 到底

A:Why did you stand there without a word?
A:你怎么站那儿一句话也没有？

B:I didn't know what on earth to answer.
B：我不知到底该说些什么。

A:Then, why did you say sorry to the teacher?
A:那你怎么不和老师说你抱歉？

B:I don't know, I just felt afraid at that time.
B:我也不清楚自己是怎么回事，那会儿我就是觉得害怕。

A:You should change it.
A:你该把这一点改掉。