With the help of high technology.more and more substances in the past years．( )A．discoveredB．have discoveredC．had been discoveredD．have been discovered 题目和参考答案——青夏教育精英家教网——

题目内容

4．With the help of high technology，more and more substances _________ in the past years．（　　）

	A．	discovered		B．	have discovered
	C．	had been discovered		D．	have been discovered

分析在先进技术的帮助下，在这十年间越来越多的新物质被发现．

解答答案：D 由句中的时间状语in the past years可知，空格应填现在完成时；又因句子中的主语new substances与discover为被动关系，故选D项．

点评要分析相关主语和谓语动词之间的关系，另外要注意句中的时态．

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