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:高中英语 来源: 题型:
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:高中英语 来源: 题型:
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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