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单选题
62.If the new safety system to use, the accident would never have happened.
A
A.were put
B
B.had been put
C
C.should be put
D
D.would be put
答案解析
正确答案：B
解析：
62.【翻译】如果新的安全系统已经投入使用，这次事故就不会发生了 口【精析】B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 never have happened可知，此处表示 与过去事实相反的假设，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，所以应用被动语态；故选B .
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