– 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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– 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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