7.5 present perfect, present perfect continuous, past simple 1. This system was / has been first used in 1996. But since that time it was only / has only been used rarely. 2. This problem was / has been addressed by several authors Blake, Milton, Holt, but so far no one managed / has managed to find a complete solution. 3. Could you please send the fax again as it was / has been too faint to read. 4. The department was / has been relocated herein. The department was / has been located here since 2012. 6. He went / has been abroad three times last year. 7. She went / has been there three times this year. 8. What did you do / have you done before you joined / have joined this lab 9. How many projects did you do / have you donein your present role 10. Ii bwent / have been thereon Saturday. 1. was, has been 2. has been, has managed 3. was 4. was 5. has been 6. went 7. has been 8. did you do, joined 9. have you done 10. went
