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МатематикаВопрос:
21. People (fly) by planes since 1903.
Ответ:
21. People have flown by planes since 1903.
В данном предложении необходимо использовать Present Perfect, так как речь идет о действии, которое началось в прошлом (с 1903 года) и продолжается до настоящего момента.
Ответ: have flown
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