问题补充：
This piece of music is worth .
A. to listen
B. to listen to
C. listening
D. listening to
答案：
A. to listen
B. to listen to
C. listening
(答案→)D. listening to
解析：be worth doing是“值得做某事”，故排除AB；listen to the music只不过这里的music在前面，故to不能省略。所以本题选D。
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