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 knew
C、didn’t man know
D、did man know
答案D
解析 否定词not在句首，要求用部分倒装的句子结构。
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