摘要： Not until the early years of the 19th century what heat was. A. man did know B. did man knew C. didn't man know D. did man know

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Not until the early years of the 19^th century ________ what heat was.

A. man did know B. did man knew C. didn't man know D. did man know

Not until the early years of the 19^th century ______ what heat was.

Not until the early years of the 19th century ______ what heat was.