America will never again have as a nation the spirit of adventure as it______bef

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问题 America will never again have as a nation the spirit of adventure as it______before the West was settled.

选项 A、could
B、did
C、would
D、was

答案 B

解析该题是语法结构题，考查动词替代的用法。从意义上来看，空格处应该填had，但主句中have是实义动词，为避免重复，可用助动词do替代。该处表示过去的事实，所以要用一般过去时态，即用did替代had。因此，根据题意和语法规则，选项B为最佳答案。

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