Not until the early years of the 19th century ______ know what heat is.A、did man

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问题 Not until the early years of the 19th century ______ know what heat is.

选项 A、did man
B、man did
C、have man
D、man have

答案 A

解析直到19世纪初，人类才知道热能是什么。not until放在句首，表示“不到……不，直到……才。”后面的句子要用倒装。故选A/

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