问题补充：
--- Look! That teacher is explaining something to her students again and again.
--- teacher she is.
A. How patient
B. What a patient
C. How stubborn
D. What stubborn
答案：
A. How patient
(答案→)B. What a patient
C. How stubborn
D. What stubborn
解析：句意：---看！那位老师正在给她的学生一次又一次地解释什么东西。---多么有耐心的老师啊。感叹句句型：1.What +adj+un. +主语+谓语，2. What +a+adj+单数名词+主语+谓语，3. What +adj+复数名词+主语+谓语，4.How+adj/adv+主语+谓语,因此选B正确。
考点: 考查感叹句的用法。
