This missile is designed so that once_____ nothing can be done to retrieve it. [ 2 分 ] A. fired B. being fired C. they fired D. having fired - 自考题库

This missile is designed so that once_____ nothing can be done to retrieve it. [ 2 分 ] A. fired B. being fired C. they fired D. having fired

出自：乐山师范学院-综合英语

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