2012考研必备：考研英语语法精要(4)

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4.完成进行时指动作在完成时的基础上还要继续下去。如：
     The company has been promising a rise in salary for ages, but nothing has happened.
    The school board listened quietly as John read the demand that his followers had been demonstrating for.
   
    时态、语态答题思路：
    (1)先根据选项的区别点确定考题要点为时态，然后回到题句中寻找给出的或暗示的时间状语，缩小选择范围，进而选出正确答案；
    (2)根据谓语动词与句子主语或非谓语动词与其逻辑主语的关系，确定句子是主动语态还是被动语态。