题目内容

16．______  it  is  the  first  choice  of many  young  travelers，Europe  is  also  seen  as  a wonderful tourist attraction by many old people．（　　）
A．WhileB．UnlessC．OnceD．Until

分析 虽然欧洲是年轻游客的首选，但它也被许多老年人视为旅游胜地．

解答 答案A．
while表示"当…的时候"，引导时间状语从句；意为"尽管、虽然"，引导让步状语从句．unless"除非，如果不"，在意义上相当于if…not，因此在有些场合中unless与if…not可互换使用，引导条件状语从句．once"一旦"，引导条件状语从句．until"直到"，引导时间状语从句．分析可知前后两句话之间是逻辑上的"让步"关系，再结合句子所表达的意思可知答案选A．

点评 本题考查从属连词的用法．连词的用法辨析，要注意分析主从句之间的逻辑关系，再确定相应的连词，同时注意不同的连词的语义及用法区别．

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