The United States has become a significant musical around the world.A. effectB. affectC. i

问题补充：

The United States has become a significant musical around the world.

A. effect

B. affect

C. infection

D. influence

答案：

A. effect

B. affect

C. infection

(答案→)D. influence

解析：influence有影响力；effect 效果，影响；infection 感染；affect动词，意为“影响”。