2. 外语
  3. The rapid development of American economy after the Civil War was due to______.

The rapid development of American economy after the Civil War was due to______.

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问题 The rapid development of American economy after the Civil War was due to______.
选项 A、the stable political environment and the availability of capital
B、large pool of labor force because of free immigrants
C、scientific invention and government policy
D、all of the above
答案D
解析
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