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14．Since the dawn of human history，human beings _______ questions like"What is the real meaning of life"．（　�。�

	A．	are asking		B．	have been asked
	C．	are asked		D．	have been asking

分析句意：自從人類歷史的出現，人類就不斷的問像"生命的真正意義是什么"這樣的問題．

解答答案：D"be doing"表示現在正在進行的動作；"has/have been done"現在完成時的被動語態(tài)，表示過去發(fā)生的動作對現在的影響；"be done"表示現在的客觀事實；"have/has been doing"表示過去發(fā)生的動作，一直持續(xù)到現在，可能剛剛結束，也可能繼續(xù)持續(xù)下去．根據句意可知，動作是從過去開始的，可能還會繼續(xù)持續(xù)下去，用現在完成進行時，故選D．

點評本題考查現在完成進行時，要掌握其用法并結合具體的語境選擇出正確的選項．

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