I still remember the grand school used to be a abandoned airport two years ago.A. howB.

问题补充：

I still remember the grand school used to be a abandoned airport two years ago.

A. how

B. where

C. when

D. why

答案：

A. how

B. where

(答案→)C. when

D. why

解析：考查宾语从句：句意：我还记得这个宏伟的学校过去是个废弃的飞机场的时候。A. how怎样， B. where哪里，C. when什么，D. why为什么，根据句意，选C。