____good weather!Why not go out for a walk?A.what B.how答案是what,请问为什么不用how?

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____good weather!Why not go out for a walk?A.what B.how答案是what,请问为什么不用how?
____good weather!Why not go out for a walk?
A.what B.how
答案是what,请问为什么不用how?

____good weather!Why not go out for a walk?A.what B.how答案是what,请问为什么不用how?
what
本应是 what (a)good weather it is!
但weather是不可数名词,不能要a、而it is 就省略了

此举为感叹句,WHAT的句式是WHAT+形容词+名词
HOW的句式是HOW+a+形容词+名词

What....
如果用how...
How good the weather is!

此句为感叹句,WHAT的句式what是+形容词+名词后面主和谓可省
HOW的句式是how+形容词+a/an/the+名词