We on it for several hours but we haven't yet reached any conclusion．( )A．are workingB．workC．have been workedD．have been working 题目和参考答案——青夏教育精英家教网—

4．We on it for several hours but we haven't yet reached any conclusion．（　　）

	A．	are working		B．	work
	C．	have been worked		D．	have been working

分析我们一直努力了好几个小时，但是至今善未得出任何的结论．

解答答案：D．根据but后的现在完成时态，可以判断出到现在还没有得出结论，有可能还要继续下去，所以要现在完成进行时．．C表示现在完成时的被动态，与题意不符．

点评考查现在完成进行时．
reach vt．到达，达到，伸出，影响 vi．达到，延伸，伸出手，传开．
1．reach after 努力谋求，竭力达到伸手想抓
2．reach back 回忆，回顾
3．reach for 伸出手去抓
4．reach out 伸手拿[抓]；伸向前；追求；伸出援助之手，提供援助

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