The List of World Heritage in Danger places sites subject to unusual levels of pollution, natural hazards, or other problems, until _________ are made. proposal nothing paperwork improvement A. B. C. D.
正确答案：D
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The List of World Heritage in Danger places sites subject to unusual levels of pollution, natural hazards, or other problems, until _________ are made. proposal nothing paperwork improvement A. B. C. D.
正确答案：D
