– Unfortunately, I won’t have time to visit the World Expo 2010 I’m in Shanghai. – What a great pity! A. until B. since C. while D. unless 题目和参考答案——青夏教育精英家教网—

题目内容

– Unfortunately, I won’t have time to visit the World Expo 2010 _____ I’m in Shanghai.

– What a great pity!

A. until B. since C. while D. unless

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