You needn’t take your shoes off when you enter someone’s house in Australia , __

题干

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

上一题下一题 0.85难度单项选择更新时间:2010-07-11 10:20:27

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