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 看到Not until...的句型,可知此为倒装句,只有C和D符合。改写为正常语序为:Man did not know what heat is until the early years of the l9th.现在将not提前,后面就不能再用否定,否则意思就变了。
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