{01}You needn’t take your shoes off when you enter someone’s house in Australia , _____ , of course , they’re very dirty .
A.before
B.since
C.when
D.unless
解析: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。 本题选D。 {02.The Forbidden City is an area __ once only the emperor, his family and officials were allowed.
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