Correct or improve the translation of the following Chinese sent

Correct or improve the translation of the following Chinese sentences.原文：在过去20年改革开放的过程中，中国已经成为世界上经济增长最快的国家之一。 译文：China is one of the fastest growing economies in the world over the past two decades since its reform and opening-up.改译：
【正确答案】：

CHINA HAS BEEN ONE OF THE FASTEST GROWING ECONOMIES IN THE WORLD OVER THE PAST TWO DECADES SINCE ITS REFORM AND OPENING-UP.

【题目解析】：China has been one of the fastest growing economies in the world over the past two decades since its reform and opening-up. (考点：时态的正确使用。）