| 12+ Свидетельство СМИ ЭЛ № ФС 77 - 70917 Лицензия на образовательную деятельность №0001058 |
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Сложность вопроса:
-He (not know) foreign languages well before he (enrol) these courses
1) didn't know, enrolled
2) hadn't known, enrolled
3) didn't know, had enrolled
4) hadn't known, had enrolled