新概念2第一课的问题课文中 A young man and a young woman were sitting beh

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新概念2第一课的问题
课文中 A young man and a young woman were sitting behind me .They were talking loudly .为什么要用过去进行时呢?14页的练习B的题目的第二句There is a line under each word or group of words in the statements below中的under ,below在此走有什么意义

A young man and a young woman were sitting behind me . They were talking loudly . 这个是作者在陈述当时那一男一女正在做的事情,所以用过去进行时.
There is a line under each word or group of words in the statements below. 把这句话分为两段比较好理解,a line under each word or group of words,表示的是词或词组的下划线, in the statements below 在下列语句中. 有不同的意思,不重复的,修饰的词不同.
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