In 1960 this was the longest bridge that .A. was ever builtB. had ever builtC. has ever b

问题补充：

In 1960, this was the longest bridge that .

A. was ever built

B. had ever built

C. has ever been built

D. had ever been built

答案：

A. was ever built

B. had ever built

C. has ever been built

(答案→)D. had ever been built

解析：由“was”可知要用过去时，又由“the longest”可知有比较意味，要用完成时。