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The legacy of______expansion brought together under a single government and economy the land that comprises the United States today.
A.eastward
B.northward
C.southward
D.westward

A.A.eastward
B.northward
C.southward
D.westward

【参考答案】

D
美国的西进运动对拓展其疆界，促进美利坚民族的融合产生了重要的意义。
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