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    精英家教网 > 高中英语 > 题目详情
    10．At the end of the meeting，it was announced that an agreement _____．（　　）
    A．has been reachedB．has reached
    C．had been reachedD．had reached

    分析 会议结束时，宣布达成了一项协议．

    解答 C 考查被动语态．分析句子可知，it是形式主语，that an agreement 引导的从句是真正的主语，在这个主语从句中reach与主语agreement之间是被动关系，所以用被动语态，故答案选C．

    点评 被动语态由"助动词be+及物动词的过去分词"构成．被动语态的时态变化只改变be的形式，过去分词部分不变．疑问式和否定式的变化也如此．掌握各种时态的被动语态是解题的关键．

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