As far as sentence types are concerned, they embrace declarative, interrogative, ( ) and exclamative sentences.
【正确答案】：IMPERATIVE
【题目解析】：题干译文：就句子类型而言，句式习语包括陈述句、疑问句、什么句和感叹句？ As far as sentence types are concerned, they embrace declarative, interrogative, imperative and exclamative sentences. 答案为imperative
