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МатематикаВопрос:
6a Complete the sentences with the present perfect form of the verbs and for or since. Don't worry about the red parts of the sentences at the moment. 1 People____________________ (use) the main active ingredient in aspirin for/since at least 400 BC/1897. 2 The International Red Cross and Red Crescent movement ____________________ (exist) for/since 1863/1939. 3 Doctors____________________ (know) how to do heart transplants for/since about 20/50 years. 4 People____________________ (study) things with microscopes for/since about 1600/1800. 5 it ____________________(be) possible to X-ray the body for/since approximately 50/120 years.
Ответ:
Ответ:
Краткое пояснение: Используем Present Perfect и выбор между for/since для указания длительности или начальной точки действия.
- People have used the main active ingredient in aspirin since at least 400 BC/1897.
- The International Red Cross and Red Crescent movement has existed since 1863/1939.
- Doctors have known for about 20/50 years how to do heart transplants.
- People have studied for about 1600/1800 things with microscopes.
- It has been for approximately 50/120 years possible to X-ray the body.
Ответ:
Тайм-трейлер: Пока другие мучаются, ты уже на финише. Время для хобби активировано
Покажи, что ты шаришь в годноте. Поделись ссылкой с бро
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