John is crazy about pop music.
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答案：A
be crazy/mad about“对······痴狂”。crazy和mad可以替换。例如：They are mad about football．他们对足球很狂热。sorry“难过的，抱歉的”，例如：He was sorry for her and tried to cheer her up．他为她感到难过，并试图使她振作起来。concern about“对······关心、忧虑”，例如：And scientists concerned about climate change believe it will cause more drought in many areas in the future．关心气候变化的科学家们相信，气候变化在未来会导致大部分地区更加干旱。be worried about“对······担心”。