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!
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