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    You needn’t take your shoes off when you enter someone’s house in Australia , _____ , of course , they’re very dirty .
    A．beforeB．sinceC．whenD．unless
    D
    考查连词。before 在什么之前，since 自从，when 当什么时候，unless 除非，句意：当你在澳大利亚进入某人家里的时候你没有必要把鞋脱掉，当然，除非你的鞋非常脏。所以选D。
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