英语词汇与语法结构选择1.With the development of the Internet,people's l

英语词汇与语法结构选择
1.With the development of the Internet,people's life_______in the past few years.
A is improving B has been improved
C is improved D had been improved
答案给的是B 为什么不能选D.现在完成时不是表示过去已经做完的事情对现在有影响吗?过去完成时不是表示过去的过去吗?那in the past few years不是表示过去了吗?不应该选过完吗