Ответ:
1. Have discovered.
2, have been testing.
3. have had.
4. have not started.
5. has showed.
6. has always been.
Объяснение:
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Answers & Comments
Ответ:
1. Have discovered.
2, have been testing.
3. have had.
4. have not started.
5. has showed.
6. has always been.
Объяснение: