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    精英家教网 > 高中英语 > 题目详情
    All reference books ________， he didn't find the key to the question.
    A．being searchedB．searched
    C．to be searchedD．were searched
    B
    B考察非谓语动词。句义：所有的参考书都查遍了，他还是没有找到问题的答案。该句中的，reference books与search之间构成被动关系，而且表示动作已经完成，使用过去分词做状语。故B正确。
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