great fun it was to visit the World Expo in Shanghai last year! A. WhatB. HowC. What aD.

问题补充：

great fun it was to visit the World Expo in Shanghai last year!

A. What

B. How

C. What a

D. How a

答案：

(答案→)A. What

B. How

C. What a

D. How a

解析：将后文的主谓去掉之后，最后一个词为fun为不可数名词，故选A

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