题目内容
We_______on this project for four hours. Let’s have a rest.
| A．are working | B．have been working | C．worked | D．had worked |
B
解析试题分析：考查时态。本题的关键词是for four hours，描述的是联想工作了4个小时,通常与现在完成进行时连用。句意：我们已经连续工作了4个小时了，让我们休息一下吧!现在完成进行时表示动作从过去开始，一直持续到现在，而且强调正在发生。故B正确。
考点：考查时态
点评：英语中的时态主要由动词的形式决定，因此在学习英语时态时，要注意分析动词形式及具体语境，想象在那个特定的时间动作所发生的背景，这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。
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