Although the Eiffel Tower to last for 20 years it is still standing today.A. has designe

问题补充：

Although the Eiffel Tower to last for 20 years, it is still standing today.

A. has designed

B. had designed

C. is designed

D. was designed

答案：

A. has designed

B. had designed

C. is designed

(答案→)D. was designed

解析：考查时态与被动语态。Eiffel Tower与design是动宾关系，应该使用被动语态，排除A、B；设计埃菲尔铁塔的动作发生在过去，应该使用一般过去时，排除C。故选D。