Not until the early years of the 19th century _________ what heat is.

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

选项 A、man did know
B、man know
C、didn’t man know
D、did man know

答案D

解析 本题为倒装句题。看到Not until…的的型,我们知道为倒装句,答案在C项和D项中选一个。改写为正常语序为“Man did not know what heat is until the early years of the 19th.”。现在将not提前,后面就不能再用否定了,否则意思就变了,故排除C项。句意:直到19世纪初,人们才知道什么是温度,故选D。
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