1.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
变式1.The experience was designed _______ what effect the medicine had on the patient.
A. to find out B. finding out C. find out D. having found out
解析1. 动词的时态与语态在语境中的实际运用。by the end of 短语应该使用完成时态，而last month暗示应该使用过去时态。故此综合两个条件必须使用过去完成时态。答案：B
变式1. 考查句型“sth. be designed to do sth.”该句型表示“什么事情的目的是怎么样。”答案：A
