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14．All the task          ahead of time，they decided to go on holiday for a week．（　　）
A．had been finishedB．were finished
C．having been finishedD．been finished

分析 所有任務都提前完成，他們決定去度一個禮拜的假．

解答 答案：C 題干中有逗號分隔，沒有連詞，要用非謂語動詞；句中finish與task之間構成動賓關系，要用被動；句意表達的是已經完成的動作，要用分詞的完成式；分詞帶有之間的邏輯賓語，是獨立主格結構．故選C．

點評 獨立主格結構由兩部分組成，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．獨立主格結構本身不是句子，在句子中作狀語，表時間、原因、條件、伴隨、目的及狀態等．

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