(单选题)
According to paragraph 1. the U.S economy became the largest and the most modern in the world because ( ).
A.the
U.S. won the American Revolution
B.there were many new inventions
C.competing with the Europe and eventually surpassed it
D.the economy grew steadily for more than 150 years
参考答案：D
参考解析：
定位到第一段Several waves of inventions and growth soon hit. This happened over a period of 150 years. These advances made the U.S. economy the largest and most modern in the world.可见，几波发明和发展让美国在150年里一直能有稳定的发展，才是让美国经济变大变现代化的原因，D项符合题意，AC两项不符合原文的表述，B项仅仅提到了发明，表述不全面。故本题正确答案选D。
知识点：
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