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You may get lost easily in big cities like Beijing        you have a map or a guide.
A.unlessB.ifC.whenD.until
A
考查连词。句意“在像北京这样的大城市里,如果没有一张地图或一个导游的话,你会很容易迷路。”unless“除非”,相当于if ...not...;when“当”;until“直到”,不符合题意。故选A。
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