America will never again have as a nation the spirit of adventure as it ( ) before the West was settled. ( 章节：2 难度：2)
- A、could
- B、did
- C、would
正确答案:B
答案解析:有
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America will never again have as a nation the spirit of adventure as it ( ) before the West was settled. ( 章节：2 难度：2)
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