I walked in our garden Tom and Jim were tying a big sign onto one of the trees.A. which

问题补充：

I walked in our garden, Tom and Jim were tying a big sign onto one of the trees.

A. which

B. when

C. where

D. that

答案：

A. which

B. when

(答案→)C. where

D. that

解析：where引导非限制性定语从句，在从句中作地点状语。句意为“我在花园里散步，汤姆和吉姆也在那里正往一棵树上绑一个很大的标志牌”。