题目信息
Mozart himself was a piano virtuoso, and the piano parts of his piano concerti, especially the mature work composed in 1784 and after, have astonishingly difficult finger work, that has demanded incomparable technique to produce the required elegance and precision.
A:that has demanded
B:which demanded
C:that had demanded
D:which demands
E:that is demanding
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正确答案：
D:which demands
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题目来源
Magoosh
