Speaking of all the songs he has written, I think this is probably his one.
better-known B. well-known C. best-known D. most-known
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解析：best-known是well-known的最高级,意为“最著名的”。根据所提供的情景“all of the songs he has written”可判断出要用形容词的最高级，表示“这可能是他最著名的一首歌”。better-known是well-known的比较级,用于比较两者哪一个更著名。