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    4．Mr．Li _____as a physics teacher for ten years in our school，and now is Party secretary-general of our city．（　　）
    A．worksB．workedC．had workedD．has worked

    分析 李老师在我们学校做了十年的物理教师，现在是我市的党委书记．

    解答 答案：B
    根据句意"…and now is Party secretary-general of our city…现在是我市的党委书记"可知，李老师现在不是物理老师了，前面的句子表达的应该是他过去是物理老师，所以要使用一般过去时．故选B

    点评 做本题时，要注意一般过去时与现在完成时的区别．一般过去时讲的只是发生在过去的动作或状态；而现在完成时表示发生在过去的动作或状态，持续到了现在，也有可能延续到将来；强调的是对现在造成的影响或结果．

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