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    精英家教网 > 高中英语 > 题目详情
    -What's up? You look worried.
    Well,I_____on the problem for 5 hours but I haven't got a single clue.
    A．have workedB．worked
    C．will workD．have been working
    D

    试题分析：考查时态。从时间状语 for 5 hours，可排除BC，然后根据 but I haven't got a single clue，说明work这个动作还要持续下去，故用现在完成进行时。句意：——怎么啦？你看起来很焦急。——唔，我花了5个小时在这个问题上但现在还没有什么头绪。
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