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—Tom, have you finished your homework?
—Yes, I ________ before you came back, mom.
A.finishedB.have finishedC.had finishedD.finish
C

试题分析:考查时态:句意:--汤姆,你完成作业了吗?--是,你回来前我就完成了,妈妈。说明完成作业是在妈妈回来前,是过去的过去,用过去完成时,选C。
点评:时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态,在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。过去完成时是相对的时态,是过去的动作之前发生的。
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