单选题:Itisimpliedbutnotstatedinthepassagethat(  )o

题目内容:

Itisimpliedbutnotstatedinthepassagethat(  )o A.therewasashortageofworkersonAmericanfarms
B.themostimportantoftheearlyinventionwastheironplow
C.after1869,manypeopledevotedtheirattentiontotheplow
D.CharlesNewbolthadmadeafortunebyhiscast-ironplow

参考答案:
答案解析:

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