this missile is designed so that once fired nothing can be d

this missile is designed so that once fired nothing can be done to retrieve it.
希望能帮我分析一下句型和语法.我看不懂为什么once后面是fired而不是其它选项如being fired或 they fired 或having fired.
那么nothing can be done to retrieve it在句中又作什么成分呢.

谢千 1年前已收到1个回答举报

今夜星光灿烂gh 幼苗

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设计这种导弹的目的在於一旦它发射了,任何举措都不可以重新找回它.
因为once 它后面是一种假设的情况呀,所以就得用fired,虚拟语气来的
这句话它省略了一些东西,完整的句子应该是这样的:this missile is desingned so that once this missile is fired nothing can be done to retrieve it.

1年前

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