问题补充：
exciting news! We’ve never had long vacation before.
A. What; such a
B. What an, such a
C. How; so
D. What ; so a
答案：
(答案→)A. What; such a
B. What an, such a
C. How; so
D. What ; so a
解析：句意：多么令人兴奋的消息！之前我们从没有如此长的假期。感叹句中消息是不可数名词，用what引导；假期是可数名词用such来修饰。What+a(an)+（形容词）+单数可数名词+主语+谓语！. What+(形容词）+可数名词复数或不可数名词+主语+谓语！how用来修饰形容词、副词或动词。其结构是：How+形容词（副词）+主语+谓语！故选A.
