He has been working on this research these three years and ( ) outstanding results.

题目

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

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-...