问题
选择题
The new suspension bridge ___by the end of last month.
A．has been designed
B．had been designed
C．was designed
D．would be designed
答案
答案：B
考查时态。根据时间状语by the end of last month.到上个月末可知，用过去完成时，主语The new suspension bridge与动词design为被动关系，故选B。
