The idea of a way out of the trouble had never________to anyone.
A:happened
B:occurred
C:appeared
D:flashed
《齐民要术》有这样一段描述:“凡五果,花盛时遭霜,则无子。天雨新晴,北风寒彻,是夜必霜。然放火作煜,少得烟气,则免于霜矣。”,据此回答下列各题。