Ответ:
1 He has been working on...
2 How much field data have you collected?
3 Eric anb Al have been studying agriculture...
4 They have designed....they have been demonstrating...
5 .....have made
6 They have not been using...
Объяснение:
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Ответ:
1 He has been working on...
2 How much field data have you collected?
3 Eric anb Al have been studying agriculture...
4 They have designed....they have been demonstrating...
5 .....have made
6 They have not been using...
Объяснение: