A. The Shanghai Expo has had a major impact upon China. It is the first World Expo held in a developing country in the event's 159-year history.
B.The Shanghai Expo has had a major impact upon China. It is the first World Expo to be held in a developing country in the event's 159-year history.
C.The Shanghai Expo has had a major impact upon China. It is the first World Expo to have been held in a developing country in the event's 159-year history.
Top answer
All 3 are perfectly fine. Use A: it's the most succinct.
— Mister Micawber
All 3 are perfectly fine.
Use A: it's the most succinct.
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