Her mother told me that she hadn't heard ________ music before.A.such a piece of beautifulB.a beautifulC.so beautiful aD.a such wonderful
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A解析music为不可数名词，“一首音乐”应该说“a piece of music”；“如此……人/物”的表达方式：单数名词：such +a/an+ adj．+n．=so +adj．+a/an +n．，复数名词或不可数名词只能用such结构，但many/much/few/little只能用so。