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13．______ for years，life on other planets is still a mystery for human beings．（　　）

	A．	Having been looked		B．	Having been looking
	C．	Having looked		D．	Looked

分析（盡管）已經找了很多年，外星生命對人類而言仍然是個謎．

解答答案：A
題干中look for和主語life構成動賓關系，要用被動；句中有for years多年，是表達動作持續的時間，是完成時態的時間狀語．故選A．

點評現在分詞是非謂語動詞的一種，表達主動或進行；過去分詞表達被動或完成；動詞不定式表達未發生的動作．學習時，要注意區分和掌握．

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