I haven’t finished my homework yet. I      my mother with the housework all day

I haven’t finished my homework yet. I      my mother with the housework all day

题型:不详难度:来源:
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

答案
C
解析

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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