______ it is the first choice of many young travelers, Europe is also seen as a wonderful tourist at...
2022-11-03 13:26:17 195次 2014-2015学年浙江省宁波市高三上学期期末英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
______ 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
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