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        1. You may get lost easily in big cities like Beijing        you have a map or a guide.
          A.unlessB.ifC.whenD.until
          A
          考查連詞。句意“在像北京這樣的大城市里,如果沒有一張地圖或一個導游的話,你會很容易迷路。”unless“除非”,相當于if ...not...;when“當”;until“直到”,不符合題意。故選A。
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