The young man was lying on the grass with his horse a tree.
A. being tied
B. tied to
C. tying to
D. was tied to
网友回答
A. being tied
(答案→)B. tied to
C. tying to
D. was tied to
解析：考查with的复合结构，句意：这个年轻人躺在草地上他的马被栓在一棵树上。tie，栓，绑，系，与介词to 连用，his horse 与tie之间是被动关系，所以用过去分词，选B。