23、 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
科目：高中英語(yǔ) 來(lái)源： 題型：
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
科目：高中英語(yǔ) 來(lái)源： 題型：
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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