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    4．The possibility of a murder _____，the police have set about looking for the clues to her suicide．（　　）
    A．to be excludedB．to exclude
    C．having excludedD．having been excluded

    分析 既然谋杀的可能性已经被排除，警察开始着手寻找她自杀的线索．

    解答 答案：D  题干中有逗号分隔，没有连词，要用非谓语动词；possibility与exclude构成动宾关系，要用过去分词表示被动；句意表达的exclude动作发生在set about之前，要用分词的完成式．故选D．

    点评 独立主格结构由两部分组成，前一部分是名词或者代词，后一部分是非谓语动词（不定式、现在分词、过去分词）或形容词、副词、名词或介词短语．独立主格结构本身不是句子，在句子中作状语，表时间、原因、条件、伴随、目的及状态等．

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