The fence along the middle of the road is designed to_____ve

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The fence along the middle of the road is designed to_____vehicles ______ crashing into each other.
A safegurad,against B protect ,against
C warn ,of D keep ,from

明显选B嘛
protect ...from/agains + 动名词.固定用法
表示“保护……不使受到……的损害或侵犯”时常用结构protect...against/from...来表示,但较大的事件如天灾多用against,小事件如冷气则用from.

The fence along the middle of the road is designed to_____ve Happiness is found along the way--not at the end of the road Go （）along the road.The bus stop is at the end of it. There is a big stone in the middle of the road .Let us move There is a man in the middle of the road,but no one stops hi Standing in the middle of the road is very dangerous; you ge stangding on 还是in the middle of the road He managed to get ____ the fence onto the road. don't ride in the middle of the road or run()the road.1throu There is a dog ___ the road.A.in the middle B.in the middle It is the middle of the day This bookstore is along that road on the road.为什么用along和on