______ fine weather let's go swimming A what a B what C how a D how

______ fine weather let's go swimming A what a B what C how a D how
______ fine weather let's go swimming A what a B what C how a D how

______ fine weather let's go swimming A what a B what C how a D how
B
what +adj+n（+主=谓语）+!
how+adj（+主+谓）+!
如果n是可数名词还可以在adj前面加相应的冠词,本题weather为不可数,不加不定冠词
所以B

因为weather是不可数名词，所以排除A、C。而结构又属于How一类的，所以选择D!

a