I ___________in the park when i saw a new bag on the ground．

题目

I ___________in the park when i saw a new bag on the ground．
a．walked b．took a walk c．was walking d．am walking
请说明原因!

答案

I _____c______in the park when i saw a new bag on the ground．a．walked b．took a walk c．was walking d．am walking首先看后面从句是过去式,所以排除了 D 因为D不是过去式.另外,根据这句话的语气哦,是“我正...