untill the early years of the 19th century did man know what heat is.

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• not until the early years of the 19 century ___ what heat is.A.man did know B.man knew C.didn't man know D.did man know请高手为我讲下not until...的用法,not...until我知道怎么用,但是not until...我不清楚,请高手讲下,我将感激不尽,
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