Which is the longest bridge the Changjiang River do you know ?A. through B. across C. on

问题补充：

Which is the longest bridge the Changjiang River , do you know ?

A. through

B. across

C. on

D. over

答案：

A. through

B. across

C. on

(答案→)D. over

解析：一般桥在水之上都用over, 所以选D.