Предложение поставить во времена Present, Past, Future Indefinite; Present, Past, Future Continuous; Present, Past, Future Perfect; Present Prefect Continuous. Предложение: The practice of controlling or preventing a monopoly varies from country to country.
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Ответы

Present
1. The practice of controlling or preventing a monopoly varies from country to country
2. is varying
3. has varied
4. has been varying
past
1. varied
2. was varying
3. had varied
4. had been varying
future
1. will vary
2. will be varying
3. will have varied
4. will have been varying
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