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

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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

解析从意义上来看，空格应填had，但主句中have是实义动词，为避免重复，可用助动词do替代，即用did替代had，故B为答案。

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