The music .A. sound beautifulB. sounds beautifullyC. sound beautifullyD. sounds beautiful

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A. sound beautiful
B. sounds beautifully
C. sound beautifully
(答案→)D. sounds beautiful
解析：主语The music是不可数名词，系动词要用单数，排除A,C；sound听起来，是系动词，用形容词作表语。所以选D。