2. 外语
  3. Not until the early years of the 19th century ______what heat is.

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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