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    【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】如果新的安全系统被投入使用，这个事故本就不会发生．根据句意可知，考查虚拟语气．跟故去事实相反，从句用had done，主句用would have done，再结合new safety system 是被投入使用，故用had been done，即答案为A．

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