问题补充：
— the earthquake in Yushu is!
— Yes, we should try our best to help them.
A. What terrible
B. How terrible
C. How terribly
D. what terribly
答案：
A. What terrible
(答案→)B. How terrible
C. How terribly
D. what terribly
解析：感叹句主要有what和how构成：
1、what修饰名词或名词短语，有以下两种形式： 1. What+a(an)+（形容词）+单数可数名词+主语+谓语！或是：What+名词词组+主语+谓语！ 2. What+(形容词）+可数名词复数或不可数名词+主语+谓语！
2、How引导的感叹句。 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！
根据下文the earthquake in Yushu is!可知选B。
