问题补充：
I think the music is great, it 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：句意：我认为这个音乐很不错，很值得听。短语be worh doing值得做某事，listen是不及物动词，后面接宾语需加to，故选D。
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