D
根据句子结构可知，此处的block是非谓语，作road的宾语补足语，而同时road和block之前存在着被动关系，因此选择D项，句意为，当我们看到路被大雪挡住的时候，我们决定这个假期就呆在家里了。
【考点定位】考察非谓语动词。
When we saw the road
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