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    精英家教网 > 高中英语 > 题目详情
    Various efforts over the centuries _________ to predict earthquakes to reduce the damage.
    A．are being madeB．have been madeC．were madeD．were being made
    B

    试题分析：句意：几个世纪以来，已经做了各种努力来预测地震，减少损失。make efforts 做出努力，变被动形式。故选B。
    考点: 考查动词时态和语态的用法。
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