--- A high-tech exhibition in the National Museum.
--- Really? What about visiting it now? .
A. will be held
B. is being held
C. is to be held
D. has been held
网友回答
A. will be held
(答案→)B. is being held
C. is to be held
D. has been held
解析：根据What about visiting it now语境可知“展览”正在被举行，所以用现在进行时的被动语态形式。 “在国家博物馆正在举行高科技展览”“真的吗？现在参观怎么样？”选B