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 Notuntiltheearlyyearsofthe19thcentury

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 Notuntiltheearlyyearsofthe19thcentury

 Not until the early years of the 19th century______ what heat is.

A. did man know     B. man had known      C. man knew      D. had man known

【回答】

A

知识点:倒装与省略

题型:选择题

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