After John stayed in Shanghai for a couple of days he got the impression the city was ver

问题补充：

After John stayed in Shanghai for a couple of days, he got the impression the city was very fascinating.

A. which

B. why

C. where

D. that

答案：

A. which

B. why

C. where

(答案→)D. that

解析：考查同位语从句。that 引导同位语从句，解释impression的内容。