Just as music as a universal language, .
A. so it is a mirror of the time
B. as a mirror of the time
C. it is also a mirror of the time
D. so is a mirror of the time
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(答案→)A. so it is a mirror of the time
B. as a mirror of the time
C. it is also a mirror of the time
D. so is a mirror of the time
解析：so引导结果状语从句。