作业帮He has been working on this research these three years and (
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/13 19:34:35
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?
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.
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.
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