If the new safety system________to use, the accident would never have happened.

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问题 If the new safety system________to use, the accident would never have happened.

选项 A、were put
B、had been put
C、should be put
D、would be put

答案B

解析分析句子结构可知，本句包含一个If引导的非真实条件句。根据句意和主句中的would…have happened可知，此处表示对过去情况的假设，所以从句的谓语动词应用“had+过去分词”的形式。另外，put与其逻辑主语the new safety system之间是动宾关系，应用被动语态，所以空处应用had been put。故选B。

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英语

普高专升本

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If the new safety system________to use, the accident would never have happened.

英语

普高专升本

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