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    精英家教网 > 高中英语 > 题目详情
    I haven’t finished my homework yet. I      my mother with the housework all day yesterday.
    A．helpedB．have helpedC．was helpingD．have been helping
    C

    试题分析：考查时态。本题的关键词是all day yesterday,指在昨天一天的时间里一直在做的事情，故使用过去进行时。过去进行时既可以表示在过去的时间点，或者过去的一段时间里发生的事情，或者持续的状态。句意：我还没有完成我的家庭作业。昨天一天我都在帮助我妈妈做家务。故C正确。
    点评：时态的考查要根据关键词和语境的辨析。本题关键词是all day yesterday.
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