pleasant experience it is! I think I won’t forget the tour to Xi’an for ever.A. HowB. Ho

问题补充：

pleasant experience it is! I think I won’t forget the tour to Xi’an for ever.

A. How

B. How a

C. What a

D. What

答案：

A. How

B. How a

(答案→)C. What a

D. What

解析：感叹句修饰名词时用what提问，experience当经历将时为可数名词。