it was ---that were able to have lunch in garden

选择C
这考察了so和such的区别
“so + adj.+ a/an + 可数名词单数”可以与“such + a/an + adj.+ 可数名词单数”互换,但当“such + adj.+ 可数名词复数/不可数名词”这个结构中不能用so代替,so只能与many,few,much,little连用.在本题中weather为不可数名词.