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

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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、was
C、would
D、did

答案 D

解析 as作为连词，引导方式状语从句，其意为“像……一样”。根据平行结构原则，从句中应填入实义动词had (有)。为了避免重复，用助动词did代替had，因此D正确。

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