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
考查連詞。before 在什么之前，since 自從，when 當(dāng)什么時候，unless 除非，句意：當(dāng)你在澳大利亞進入某人家里的時候你沒有必要把鞋脫掉，當(dāng)然，除非你的鞋非常臟。所以選D。
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