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    精英家教网 > 高中英语 > 题目详情

    --- Do you love teaching, Miss He?
    --- I fell in love with teaching in 2000. I ________ for twelve years by this summer.
    A．will teachB．would have taughtC．has been teachingD．will have been teaching
    D

    试题分析：考查时态。本题的关键词是by, By与完成时连用。当by后面是过去的时间，使用过去完成时；当by后面是现在的时间，使用现在完成时，当by后面是将来的时间的时候，使用将来完成时。本题的By后面使用的是this summer这个将来的时间，故使用将来完成时，本句指教书这个动作持续到现在，故使用进行时的形式。故D正确。
    点评：当by后面是过去的时间，使用过去完成时；当by后面是现在的时间，使用现在完成时，当by后面是将来的时间的时候，使用将来完成时。
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