15. At the age of 40 he was a very experienced specialist. He ................. (to achieve) a lot since he started working in that field.

Ответ (EN)

• 15. At the age of 40 he was a very experienced specialist. He had achieved a lot since he started working in that field.

Перевод (RU)

• 15. В возрасте 40 лет он был очень опытным специалистом. Он добился многого с тех пор, как начал работать в этой области.