For the last hundred years, the U.S.A. has played ______ in most parts of the world.<br> <br>A、a key actor<br>B、an important influence<br>C、a leading role

For the last hundred years, the U.S.A. has played ______ in most parts of the world.

A、a key actor
B、an important influence
C、a leading role

出自：国家开放大学网络实用技术基础

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