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 knew
B、did man know
C、man did know
D、didn’t man knew
答案B
解析 Not until置前，句子要倒装。
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