即学既练

解题思路： 理解句子含义；熟悉词汇辨析；熟悉英语语法；善于分析句子成分和句子结构
解题过程：
1 are told 2 have been produced 在过去的几年里是现在完成时的标志 3 has made recently 是现在完成时的标志 4 have taken place since 是现在完成时的标志 5 has been being talked about/have been taked about 现在完成进行时被动语态 表示动作的持续