题目内容
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[主观题]
It can be inferred from the passage that by 1870 ______.A.the steam engine had been invent
It can be inferred from the passage that by 1870 ______.
A.the steam engine had been invented
B.a national commission on agriculture had been established
C.the U.S. horse population was about 10 million
D.technology began to be more economical
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