问题补充：
---Look, the teacher is explaining something to her students again and again.
---the teacher is!
A. what patient
B. How patient
C. What a patient
D. How patient a
答案：
A. what patient
(答案→)B. How patient
C. What a patient
D. How patient a
解析：本题考查感叹句：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 teacher is!可知选B
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