It was that we went camping on the mountain.
A. such nice weather
B. so nice a weather
C. such a nice weather
D. too nice weather
网友回答
(答案→)A. such nice weather
B. so nice a weather
C. such a nice weather
D. too nice weather
解析：句意：天气如此得好，以至于我们能去山上露营了。so… that…,such…that…, 如此……以至于…….,引导结果状语从句，so +adj./adv. +that-clause, such +(a/an) adj. +n. +that-clause.,故选A。
考点: 考查状语从句的用法。