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A established cooperation with B to overcome technical difficulties and have obtained great achievements. 语法是不是正确
A established cooperation with B to overcome technical difficulties and have obtained great achievements.
本句，and 连接两个并列谓语动词，时态应一致，其他可以。改为：
1. A established cooperation with B to overcome technical difficulties and obtained great achievements.
2. A have established cooperation with B to overcome technical difficulties and have obtained great achievements.
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