Saihanba in Hebei Province was once a desert, but now it has become the biggest man-made forest in China.

河北省的塞罕坝曾经是一片沙漠，但现在它已经成为中国最大的人工林。

youdao

It has become the laughingstock of the town.

这已成为全城的笑柄。

《新英汉大辞典》

But it has become the rule online.

而在网上，个性化已经成为了商业行为的准则。

youdao

But experts say it has become the leading influenza virus in all countries.

VOA: special.2009.11.11

Okay, it could be a bit of a problem if this text has become the basis for a system of religious faith or belief, and your assumptions about it are that its telling a truth that is singular in nature.

如果这本书成为一些宗教信念系统的基本,那就有问题了,你会臆断，这本书上的都是真确的，都是非凡的。

耶鲁公开课 - 旧约导论课程节选

It has become a very large economy in the world.

成为了一个很大的经济体。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

Since then, it has become the basis of an entire food culture in Israel.

BBC: Hunting for hummus in Israel

Others held up posters that said 'NO LIARS.' It has become the opposition slogan.

CNN: Iran election race tightens

Built as recently as the late 1990s, it has become the world's most expensive mosque.

BBC: Abu Dhabi: The city of superlatives