—Was it in Shanghai where the World Expo was held you met Helen?—Yes. We hadn’t se

问题补充：

—Was it in Shanghai, where the World Expo was held you met Helen?

—Yes. We hadn’t seen each other for about 5 years.

A. where

B. that

C. which

D. who

答案：

A. where

(答案→)B. that

C. which

D. who

解析：考查强调句型。“就是在世博会举行之地上海你见到的海伦吗？” “是的，我们五年没见面了。”