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    5．Mary has been waiting days for George to make a call，but up to now he           ．（　　）
    A．didn'tB．hadn'tC．won'tD．hasn't

    分析 玛丽等乔治打电话来已经等了好几天了，但是直到现在他仍然没有打来．

    解答 答案：D．
    考查现在完成时．题干中前一个分句的谓语动词是现在完成时，第二个分句的时间状语是up to now直到现在，可知用现在完成时，强调对现在造成的影响，A一般过去时，B过去完成时，C一般将来时，D现在完成时，所以选D．

    点评 本题考查现在完成时的用法．
    现在完成时表示过去发生或已经完成的动作对现在所造成的影响或结果，也可以表示从过去已经开始一直持续到现在的动作或状态．其形式是have/has+done．

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