A-A+ Not until the early years of the 19th century_ 2022-08-01 23:31:31 问答库 阅读 168 次 问题详情 Not until the early years of the 19th century______what heat is.A．man knewB．did man knowC．man did knowD．didn"t man knew请帮忙给出正确答案和分析，谢谢！ 参考答案 正确答案：B解析：Not until置前，句子要倒装。
