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、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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