Not until the early years of the 19th century ________ what heat wasA.man did knowB.did man knewC.didn't man knowD.did man know
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D解析试题分析：考察部分倒装。本题考察的是否定词放在句首构成的部分倒装。1) 以否定词开头的句子要求部分倒装。注意下列句子中助动词或情态动词提前、甚至补充助动词的用法： 例：Not until yesterday did little John change his mind.（小约翰直到昨天才改变了主意。） In no country other than Britain, it had been said, can one experience four seasons in the course of a single day.（据说除了英国世界上没有哪个国家能让人在一天中感受到四季变化） 2) 以否定副词开头并加状语放在句首的句子要求部分倒装。这些否定副词有barely, hardly, little, seldom, scarcely…… when, never, no sooner…… than, rarely, no more, not nearly, not only等以及only。 Only in the country can you learn the “true English”. 3）一些如scarcely……when, no sooner ……than, hardly……when引导的主从复合句主句要求使用过去完成式。本题中把not until the early years of the 19th centur放在了句首，故D正确。考点：考察部分倒装