The new bridge by the end of last month.A. has been designedB. had been designedC. was de

问题补充：

The new bridge by the end of last month.

A. has been designed

B. had been designed

C. was designed

D. would be designed

答案：

A. has been designed

(答案→)B. had been designed

C. was designed

D. would be designed

解析：考查时态和语态。本题的根据是抓住by的用法，by与完成时连用，本题后面的时间是过去的时间，故使用过去完成时。句意：到上个月结束时为止，这座新的桥梁已经被设计出来了。根据句意说明B正确。