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 雖然歐洲是年輕游客的首選，但它也被許多老年人視為旅游勝地．

解答 答案A．
while表示"當…的時候"，引導時間狀語從句；意為"盡管、雖然"，引導讓步狀語從句．unless"除非，如果不"，在意義上相當于if…not，因此在有些場合中unless與if…not可互換使用，引導條件狀語從句．once"一旦"，引導條件狀語從句．until"直到"，引導時間狀語從句．分析可知前后兩句話之間是邏輯上的"讓步"關(guān)系，再結(jié)合句子所表達的意思可知答案選A．

點評 本題考查從屬連詞的用法．連詞的用法辨析，要注意分析主從句之間的邏輯關(guān)系，再確定相應的連詞，同時注意不同的連詞的語義及用法區(qū)別．

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