衣帽间 卫生间 隔断:The missile is designed so that once____nothing can be done to retreive it!

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The missile is designed so that once____nothing can be done to retreive it!
A.fire B. having fired C.fired D.they fierd
应该选择哪个 为什么？谢谢！

选C，完整的写法应该是 so that once it is fired,nothing can ……，这里省去了it is ，也是常用的表达形式，过去分词表示被动。

c
这里once后的 it is 被省略了，是省略句。
fired 是非谓语动词

选C

The missile is designed so that once____nothing can be done to retreive it! Missile Launcher The cage is ? the branch. What is the love? the future is now The photo is quite_____her. How is the food? What is the SWIFT? is the canda bigest is this the reason ........?????