题目内容
【题目】 If the new safety system _______ to use, the accident would never have happened.
A. had been put B. were put C. should be put D. would be put
【答案】A
【解析】
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探究与巩固河南科学技术出版社系列答案
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探究与巩固河南科学技术出版社系列答案题目内容
【题目】 If the new safety system _______ to use, the accident would never have happened.
A. had been put B. were put C. should be put D. would be put
【答案】A
【解析】
探究与巩固河南科学技术出版社系列答案
