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МатематикаВопрос:
3)In the nineteentn century, the chemical structure of benzene was still a big mystery to scientists,.................................?
Ответ:
Ответ: In the nineteenth century, the chemical structure of benzene was still a big mystery to scientists, wasn't it?
Краткое пояснение: Tag-question строится с использованием вспомогательного глагола и местоимения, противоположных по знаку основному предложению.
Ответ: In the nineteenth century, the chemical structure of benzene was still a big mystery to scientists, wasn't it?
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