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Not until the early years of the 19th century what heat was. [ ]A. man did know

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Not until the early years of the 19th century what heat was. [ ]A. man did know

Not until the early years of the 19th century ________ what heat was.[      ]A. man did know  
B. did man knew  
C. didn't man know  
D. did man know

试题答案

D

标签：ofyearsthuntilnot

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