One of the Hong Kong booksellers who disappeared last year has said he entered mainland China illegally to help with an investigation and would give up his British citizenship because it complicated the process.
去年消失的香港書商之一表示，他非法進入中國內地協助一項調查，并將放棄他的英國公民身份，原因是這一身份使整個過程復雜化。
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