This scientist is known on this problem for about ten years．( )A．to workB．to be workingC．to have been workingD．to have been worked 题目和参考答案——青夏教育精英家教网—

16．This scientist is known _______ on this problem for about ten years．（　　）

	A．	to work		B．	to be working
	C．	to have been working		D．	to have been worked

分析人们知道这位科学家已经研究这个难题差不多有十年了．

解答答案：C
短语搭配be known to do sth做某事被人了解，被人所熟知；句中for about ten years是表示持续的时间段，是完成时态的时间状语；work on后接宾语，要用主动．故选C．

点评动词不等式是非谓语动词的一种，也是英语中比较活跃的一类结构．通常用来作主语，宾语，表语，定语，状语等．学习时要全面掌握，熟练运用．

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