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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

解析試題分析：考查倒裝句：句意：直到19世紀(jì)初，人類才知道熱能是什么。Not until 位于句首,主句采取部分倒裝.部分倒裝就是把謂語(yǔ)部分的助動(dòng)詞移到主語(yǔ)前.選D。
考點(diǎn)：考查倒裝句

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