Since the dawn of human history.human beings questions like What is the real meaning of life ．( )A．are askingB．have been askedC．are askedD．have been asking 题目和参考答案——青夏教育精英家教网—

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：自从人类历史的出现，人类就不断的问像"生命的真正意义是什么"这样的问题．

解答答案：D"be doing"表示现在正在进行的动作；"has/have been done"现在完成时的被动语态，表示过去发生的动作对现在的影响；"be done"表示现在的客观事实；"have/has been doing"表示过去发生的动作，一直持续到现在，可能刚刚结束，也可能继续持续下去．根据句意可知，动作是从过去开始的，可能还会继续持续下去，用现在完成进行时，故选D．

点评本题考查现在完成进行时，要掌握其用法并结合具体的语境选择出正确的选项．

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