By the end of 1931, the technique of dubbing ... sufficiently (perfect). Выберите один ответ:
a. perfected
b. had been perfected
c. was perfected

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Английский язык: By the end of 1931, the technique of dubbing ... sufficiently (perfect). Выберите один ответ: a. perfected b. had been perfected c. was perfected

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By the end of 1931, the technique of dubbing had been perfected sufficiently....

By the end of 1931, the technique of dubbing ... sufficiently (perfect). Выберите один ответ: a. perfected b. had been perfected c. was perfected

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By the end of 1931, the technique of dubbing ... sufficiently (perfect). Выберите один ответ:
a. perfected
b. had been perfected
c. was perfected