（2017•北京） If the new safety system _______ to use, the accident would never have happened.

题型：单选题题类：真题难易度：普通

2017年高考英语真题试卷（北京卷）含听力

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

举一反三

—Great. If I were him, I the wrong decision then.

—It has been estimated that if the bridge were p{#blank#}1{#/blank#} with cars, it would still only be carrying a third of its total capacity.

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