fantastic time they had playing hide-and-seek in the park!A. HowB. What C. How aD. What a

问题补充：

fantastic time they had playing hide-and-seek in the park!

A. How

B. What

C. How a

D. What a

答案：

A. How

B. What

C. How a

(答案→)D. What a

解析：根据句式可知，本句是感叹句。根据感叹句的用法How强调是后面的形容词或副词，而what强调的是名词，根据advice可知，本句是强调名词，故用what，排除AC；本句实际上是固定短语have a fantastic time doing的感叹句，所以本题选D。