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TORFL B2 Practice Questions - Test Of Russian As A Foreign Language - Second Certification Level (ТРКИ-II B2) Exam

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Выберите правильный вариант: «Учёные давно изучают эту проблему, но решение до сих пор не ___ ». (Scholars have long studied this problem, but a solution has still not ___ .)
Correct Answer:
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