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

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：考查定语从句：句意：我在我们的花园里面散步，在那里汤姆和吉姆在把标志牌系到一棵树上。先行词是gardon，定语从句中缺少地点状语，用where引导定语从句，选C。