good advice! It’s so helpful to us.
A. How
B. How a
C. What
D. What a
网友回答
A. How
B. How a
(答案→)C. What
D. What a
解析：How,How a,What What a之间的区别
How +形容词+ a +名词+ 陈述语序
How+形容词或副词+ 陈述语序
What +名词+ 陈述语序
What+a+形容词+名词+ 陈述语序
What+ 形容词+复数名词+ 陈述语序
What+ 形容词+不可数名词+ 陈述语序
根据题意，good advice中心词为advice，是不可数名词，故选D.