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 既然謀殺的可能性已經(jīng)被排除，警察開始著手尋找她自殺的線索．

解答 答案：D  題干中有逗號分隔，沒有連詞，要用非謂語動詞；possibility與exclude構(gòu)成動賓關(guān)系，要用過去分詞表示被動；句意表達的exclude動作發(fā)生在set about之前，要用分詞的完成式．故選D．

點評 獨立主格結(jié)構(gòu)由兩部分組成，前一部分是名詞或者代詞，后一部分是非謂語動詞（不定式、現(xiàn)在分詞、過去分詞）或形容詞、副詞、名詞或介詞短語．獨立主格結(jié)構(gòu)本身不是句子，在句子中作狀語，表時間、原因、條件、伴隨、目的及狀態(tài)等．

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