— Excuse me I want to go to the 21st National Book Expo (世博会). Could you tell me? — Sure.

问题补充：

— Excuse me, I want to go to the 21st National Book Expo (世博会). Could you tell me?

— Sure. It is at No. 3 Changjiang Road in Harbin.

A. where it is B. where it was C. where is it

答案：

解析：考查宾语从句。宾语从句用陈述语序，排除C。从语境分析本句为一般现在时。故选A。