问题
选择题
– 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
答案
答案：C
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– 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
答案：C