In a sense,we are( )the( )of national boarders in many areas of economic activity in the world today. ( 章节：4 难度：4)_做题室

单项选择题In a sense,we are( )the( )of national boarders in many areas of economic activity in the world today. ( 章节：4 难度：4): A、witness&vanishing; B、witnessing&vanish; C、witness&vanish; D、witnessing&vanishing

正确答案：D
答案解析：
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