I can’t remember the name of the park we had a picnic then.A. whichB. thatC. whenD. where

问题补充：

I can’t remember the name of the park we had a picnic then.

A. which

B. that

C. when

D. where

答案：

A. which

B. that

C. when

(答案→)D. where

解析：本题修饰表示地点的名词park是一个定语从句，先行词是地点，故关系词可用where来表示，故本题选D。