题目内容

Take a map of New York with you while traveling ________ you have a guide or know the city well.

A. since B. if C. unless D. because

C

【解析】

试题分析：由Take a map of New York with you ...随身携带一张纽约地图...... , 可知后句应是：如果你没有向导或不很了解这个城市。since ,自从，既然；if 如果，是否；unless ， 如果不，除非；because , 因为。所以答案是C.

考点：连词辨析

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