____beautiful day it is!Let's go and have a picnic in the park.----Good idea!

问题描述:

____beautiful day it is!Let's go and have a picnic in the park.----Good idea!
a.how
b.how a
c.what
d.what a
正确答案是a,为什么?怎么看都是d啊

答案错误 应该是
D