题目内容
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 |
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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