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 Ifthenewsafetysystem

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问题详情:

 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

【回答】

【*】A

 Ifthenewsafetysystem

知识点:虚拟语气与情态动词

题型:选择题