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

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

could

did

would

was

答案及解析：本题考查省略句B选项，句意：作为一个国家来说，美国将不再具有开拓西部前所具有的那种冒险精神。从意义来看，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项为答案。A选项，could能，能够；有实际意义，与助动词不同，故排除。C选项，would将，有实际意义，与助动词不同，故排除。D选项，was为be动词，与题干不符，故排除。故正确答案为B 项。