-Why do you look so tired?-Because we for three hours without stopping.A．workB．workedC．have workedD．were working 题目和参考答案——青夏教育精英家教网—

—Why do you look so tired?
—Because we ________ for three hours without stopping.

A．work	B．worked
C．have worked	D．were working

试题分析：句意:-为什么你们看起来这么疲惫？-因为我们已经不停地工作了三个小时了。work是一个动词，意思是工作。根据句意可知，说话人已经工作了三个小时了，表示从三个小时之前就工作，一直持续到现在，故应该用现在完成时，故选C。A是一般现在时；B是一般过去时；D是过去进行时。

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