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    5．-Tom seems not so enthusiastic as he was two years ago．
    -Yes．He's really reached a point in his career ______ he has to decide what to do next．（　　）
    A．thatB．whenC．whereD．which

    分析 -汤姆似乎没有两年前那么热情了．
    -是的，他的事业真的到了必须决定下一步该做什么的关头了．

    解答 答案：C
    本句是定语从句；先行词是a point，由于该从句中缺少状语，指的是"at a point在某种关头"；故用关系副词where，故选C．

    点评 做本题时，需要掌握定语从句的结构特点以及关系副词where的用法；
    1．where 主要用于修饰表示地点的名词/代词，在定语从句中用作地点状语，
    如：This is the village where he was born．这就是他出生的村子．
          That's the hotel where we were staying last summer．这就是我们去年夏天住的旅馆．
    2．where有时还可用于抽象名词后引导定语从句，并在该从句中作状语；
    如：We have reached a point where a change is needed．我们到了必须改一改的地步．
           There are cases where the word"mighty"is used as an adverb．在一些情况下，mighty一词可用作副词．

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