【题目】______ it is the first choice of many young travelers, Europe is also seen as a wonderful tourist attraction by many old people.
A. While B. Unless C. Once D. Until
在线课程【答案】A
【解析】
试题分析：考查连词辨析。A. 虽然；然而；当……的时候 B. 除非；如果不 C. 一旦；一经 D. 直到…才；到…为止。While虽然，尽管，引导让步状语从句。句意：虽然欧洲是年轻游客的首选，它被许多老年人的视为旅游胜地。故选A。.