中文： 二十世纪末科技的繁荣，人们开始广泛使用电脑。

1). Witness 句型

The late 20th century witnessed the prosperity in science and technology, thereby giving rise to the wide application of computers.

2). With结构状语前置

With the prosperity in science and technology in the late 20th century, the computers were widely applied.

3). 倒装句

So flourishing was the science and technology in the late 20th century that computers were widely applied in various fronts.

4). 强调句型

It was the prosperity in science and technology in the late 20th century that gave rise to the wide application of computers.

三个句型分别应用在以上三句话中，相同意思用不同的句型来表达，使文章句型更加丰富。

IV总结

最后，朗阁海外考试研究中心专家要提醒考生的是，现在考生中普遍存在一种误区，认为雅思写作就是难的复杂句结构的叠加。但是无论是考官自己写的范文，还是剑桥上公布的高分范文，我们都有理由相信，复杂句不是拿雅思写作高分的必要条件。考生必须对英语的句法有大体的把握，所以我相信以上介绍的几种语法结构对考生写句子的能力以及地道表达都有很大帮助，在考试中实战性较强。