2. 职称英语
  3. Not until the early years of the 19th century ______ know what heat is.A、did man

Not until the early years of the 19th century ______ know what heat is.A、did man

游客2024-07-29  31
问题 Not until the early years of the 19th century ______ know what heat is.
选项 A、did man
B、man did
C、have man
D、man have
答案 A
解析 直到19世纪初，人类才知道热能是什么。not until放在句首，表示“不到……不，直到……才。”后面的句子要用倒装。故选A/
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