Not until the early years of the19th century what heat is. A. man did know B. man knew C. didn’t man know D. 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 the19th century _____ what heat is.
A. man did know B. man knew
C. didn’t man know D. did man know

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