A-A+
Not until the early years of the 19th century
问题详情
Not until the early years of the 19th century ______what heat is.
A．man did know
B．man know
C．didn"t man know
D．did man know请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：D
解析：看到Notuntil．．．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：Mandidnotknowwhatheatisuntiltheearlyyearsofthel9th．现在将not提前，后面就不能再用否定，否则意思就变了。
