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    精英家教网 > 小学英语 > 题目详情

    【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】试题分析：句意：如果这个新的安全系统被投入使用过的话，这个事故就不会发生了。根据主句确定是对过去情况的虚拟，所以从句谓语用had done形式，此外根据句意可知是被动，用被动语态，故A项是正确的。

    if从句的谓语动词

    主句谓语动词

    1.与现在事实相反

    动词过去式（be一律用were）

    would/could/might/should+动词原形

    2.与过去事实相反

    had done

    would/could/might/should+have done

    3.与将来事实可能相反

    a.动词过去式（be一律用were）

    b.should+动词原形（不能用would）

    c.were to+动词原形

    would/could/might/should+动词原形

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