– Unfortunately I won’t have time to visit the World Expo I’m in Shanghai.– What a

问题补充：

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

– What a great pity!

A. until

B. since

C. while

D. unless

答案：

A. until

B. since

(答案→)C. while

D. unless

解析：可联系答.案.网客服索取。

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