原句是可以的,但是用从句不够简洁,如果用phenomenon,建议用被动式。
The phenomenon is witnessed that the economy has been booming in the past several years.
用phenomenon感觉有点生硬,以下几句供参考:
The past several years have witnessed the economy booming.(最简洁)
It is witnessed that the economy has been booming these years.
温馨提示:答案为网友推荐,仅供参考