She has taught for nearly thirty years，and she________now．A.still teachesB.is still teachingC.still taughtD.will still teach
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B解析分析：由She has taught for nearly thirty years和now可以知道是说“她现在仍然在教书”的意思，teach是可以延续的动作，所以用is still teaching．(延伸)still作“仍然”解释时，动词用一般时还是进行时取决于两点：1．是延续性动词还是短暂性动词，是延续性动词用进行时，是短暂性动词用一般时。2．所说的事情是强调处于进行过程中还是指经常性的情况，前者用进行时，后者用一般时，如：I still use the watch he gave me．(我仍然在使用他给我的那块表)这里的“使用”是指现阶段的“使用”，所以用一般时。(延伸)still作“仍然”解释时，注意其位置：He still looks very young．(放在实意动词的前面)He is still very young．(放在is，am，are，was，were的后面)I still don't understand what you mean．(放在否定谓语的前面)(延伸)still修饰形容词或副词的比较级时不解释为“仍然”，要解释为“更”“益发”，still作形容词时要解释为“静止的”“不动的”“寂静的”，如：Please stand still while I take your picture．(stand still“站着不动”，still stand“仍然站着”)The town is still very quiet．