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

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

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问题 The rapid development of American economy after the Civil War was mainly due to______.
选项 A、a stable political environment and available capital for investment
B、sufficient labor supply because of free slaves and immigrants from Europe and Asia
C、scientific invention and government policies
D、all of the above
答案D
解析
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