I am trying to work out the problem and I would appreciate if you could turn the music .A.

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A. That; up
B. this; around
(答案→)C. it; down
D. you; back
解析：考查it做形式主语和词组：appreciate后面不能直接接从句，要先接it做形式宾语，再接that从句，所以第一空填it，第二空考查turn的短语，turn up出现，声音调大，turn around转身，turn down拒绝，声音调低，turn back转过身，句意：我在努力的计算这题，如果你能把音乐调低，我就很感谢了。选C。