Not until the early years of the 19th century what heat is. [ ] A．man did knowB．man knew C．didn’t man knowD．did man know 题目和参考答案——青夏教育精英家教网—

题目内容

Not until the early years of the 19th century ________ what heat is.

[　　]

A．man did know

B．man knew

C．didn’t man know

D．did man know

答案：D

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