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    9．Researchers _______ to study mice from early ages but came across technical difficulties，so they weren't sure they could expect clear results．（　　）
    A．intendedB．were intended
    C．had intendedD．had been intended

    分析 研究人员原本打算从很早的时候就对老鼠进行研究，但他们遇到了技术上的困难，所以他们不确定他们是否能得到明确的结果．

    解答 C 考查时态．had intended 本来打算，打算研究老鼠的动作发生在动词came across之前，came用的是过去时，所以intend是过去的过去，故用过去完成时，答案选C．

    点评 动词时态的考点是近几年高考试题考查的重中之重．各地高考试题对动词时态的考查越来越侧重于语境化、交际化的理解，这加大了试题的难度，没有明确的时间状语，这就要求考生对句子的语境进行正确的判断，从而选出正确的时态．

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