Justrememble,fire,ringthealarmforhelp.A.incaseofB.ontheoccasionof请告诉我B为什么不对?B是“值此之际,在...期间”意思.放到这里貌似没错呀.

Question

Just rememble,______ fire,ring the alarm for help.
A.in case of B.on the occasion of
请告诉我B为什么不对?B是“值此之际,在...期间”意思.放到这里貌似没错呀.

Answer 1

in case of fire 如果火灾发生,这个本身是个句子 类似第2楼说 俗成
IN CASE OF FIRE,KEEP YOUR COOL
IN CASE OF FIRE,KNOW YOUR WAY OUT
等等句子,在警示板上就是这样表示.
而 on the occasion of
on the occasion of one's graduation
on the occasion of someone death