important advice father gave us the other day!A. WhatB. What anC. How aD. How an

问题补充：

important advice father gave us the other day!

A. What

B. What an

C. How a

D. How an

答案：

(答案→)A. What

B. What an

C. How a

D. How an

解析：本题是感叹句，修饰名词advice用what，advice是不可数名词，无需加冠词，故本题选A。