() it is the first choice of many young travelers, Europe is also seen as a wonderful tourist attraction by many old people. ( 章节：3 难度：3)
- A、While
- B、Unless
- C、Once
- D、Until
正确答案:A
答案解析:有
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() it is the first choice of many young travelers, Europe is also seen as a wonderful tourist attraction by many old people. ( 章节：3 难度：3)
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