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МатематикаВопрос:
21. How long.... your mother been working at the university? a) do b) does c) am d) are e) is f) have g) has
Ответ:
Краткое пояснение: Для образования вопроса в Present Perfect Continuous с your mother (твоя мама) используем глагол has.
Ответ:
21. How long has your mother been working at the university?
Ответ: g) has
Правило дня: В Present Perfect Continuous (настоящем совершенном продолженном времени) используются вспомогательные глаголы have (для I, you, we, they) и has (для he, she, it).
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