问题补充：
.---good time we had at the party last night!
---Yes. It was exciting party that I would never forget it.
A. What; so
B. How; such
C. What a; such an
D. How a; so an
答案：
A. What; so
B. How; such
(答案→)C. What a; such an
D. How a; so an
解析：句意：昨晚我们在聚会上度过多么美好的时光啊！是的。那是一个如此让人激动的晚会我将永远不能遗忘。感叹句的句型：How adj/adv 主语 谓语！What a/an adj 可数名词单数+主语+谓语！What adj 不可数名词或可数名词复数+主语+谓语！time是不可数名词，故不用a/an。So/such表示如此的，这样的，so+adj+a/an+可数名词单数=such a/an+adj+可数名词单数。
