问题补充：
单选题Thebridgeissoimportanttothepeopleherethatonce________itmustbecarriedoutwithoutdelay.A.designsB.having designedC.designingD.designed
答案：
D解析这里用过去分词，相当于一个状语从句，完整的句子是: once if it is designed.
1200字范文，内容丰富有趣，写作的好帮手！
时间：2023-01-07 22:27:18
单选题Thebridgeissoimportanttothepeopleherethatonce________itmustbecarriedoutwithoutdelay.A.designsB.having designedC.designingD.designed
D解析这里用过去分词，相当于一个状语从句，完整的句子是: once if it is designed.
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