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

A.man did knowB.did man knew
C.didn't man knowD.did man know

D

解析试题分析:考查倒装句:句意:直到19世纪初,人类才知道热能是什么。Not until 位于句首,主句采取部分倒装.部分倒装就是把谓语部分的助动词移到主语前.选D。
考点:考查倒装句

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