The Young Pioneers walked________the gates with Uncle Wang．A.throughB.acrossC.overD.after
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A解析分析：通过管形物(周围有物环绕)时用through，如through the window，through the tunnel(隧道)(延伸)1)across指“横穿”，如：go across the road(穿马路)，go(swim)across the river(过河)，go across the bridge(过桥)(桥横跨河的两岸，过桥实际上是过河)。也可以用于“从宽阔的平面处的一端到另一端”，go across the desert(横穿沙漠)2)over有两个概念①静态的“在……的垂直上方”：He held his umbrella over me．(他把伞遮在我头上)②动态的“越过……的上方”：The horse jumped over the fence．(马跳过了栅栏)