He has been working on this research these three years and ( ) outstanding results.括号里面应该用 achieved 还是 has achieved?

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He has been working on this research these three years and ( ) outstanding results.括号里面应该用 achieved 还是 has achieved?

He has been working on this research these three years and ( ) outstanding results.括号里面应该用 achieved 还是 has achieved?
He has been working on this research these three years and ( ) outstanding results.
括号里面应该用 achieved 还是 has achieved?

He has been working on this research these three years and ( ) outstanding results.括号里面应该用 achieved 还是 has achieved?
答案：achieved
解析：
和前文重复的助动词或重复的主要动词也可省略（括号部分为省略的成分）.如：
1.you could have come and （you could have） told me.
2.please clean the classroom and （clean） the reading-room.
因为第二个【has】是前文重复的助动词,所以省略.

应该是has achieved,因为前面是现在完成进行时
望采纳谢谢，顺祝您学习进步，天天开心

has achieved

用 has achieved
因为前面是现在完成进行时，属于现在的时态，前后时态要一直，所以用现在完成时态，


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has achieved

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