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    Up to now, no one has come up with a（n）       explanation of why dinosaurs died out, and it remains a mystery．

    A．astonishingB．amusingC．convincingD．puzzling

    C

    解析试题分析：A．astonishing 令人惊讶的，B．amusing令人发笑的，C．convincing令人信服的，D．puzzling令人困惑的，句意：直到现在，没有人给出一个令人信服的解释为什么恐龙会灭绝，这仍然是和迷。所以选C。
    考点：考查形容词辨析

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