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МатематикаВопрос:
10. I have been to China twice. (be)
Ответ:
Краткое пояснение: Present Perfect используется для описания действий, которые произошли в прошлом, но имеют связь с настоящим, или когда важен сам факт совершения действия (здесь - 'twice').
Пошаговое решение:
- Наличие обстоятельства 'twice' (дважды) указывает на Present Perfect.
- Подлежащее 'I' требует 'have'.
- Форма глагола 'be' в Present Perfect - 'been'.
Ответ: 10. I have been to China twice.
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