单选题 {{U}}Virtually{{/U}} every theory has been concerned with either the structure or the function of the language.
【正确答案】 C
【答案解析】[分析] 副词辨析 Virtually表:事实上,实质上;而选项A.Vertically垂直地;B.Almost几乎,差不多;C.Actually实际上,事实上,竟然;D.Finally最后,终于,决定性地;因此C为答案。