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1·Bob looked back only to find an old classmate whose name escaped him for the moment.

鲍勃往后一看，结果发现一个老同学，他的名字鲍勃一时想不起来了。

2·On my way home I met my old classmate.

在我回家的路上我碰到了我的老同学。

3·Walking along the street, I met my old classmate.

我在街上走的时候碰到了老同学。

4·I got a call from my old classmate out of the blue.

我突然接到一个老同学的电话。

5·Theperson sitting onthe wherry is my old classmate.

那个坐在划艇上的人是我的老同学。

6·I chanced to run into an old classmate this morning.

今天早上我碰巧遇到了一位老同学。

7·The person sitting on the wherry is my old classmate.

那个坐在划艇上的人是我的老同学。

8·I ran into an old classmate in the morning by chance.

今天早上我偶然撞见了一位老同学。

9·I met an old classmate in the bookshop suddenly in that day.

那天我在书店偶然遇到了一位老同学。

10·I met a few friends of mine, among whom was my old classmate.

我遇见了几位朋友，其中一位是我的老同学。