Selecting a mobile phone for personal use is not an easy task,because technology_ so repidly.A.Selecting a mobile phone for personal use is not an easy task,because technology_ so repidly.A.is changing.B.has changedC.will have changed.D.will.change.

Selecting a mobile phone for personal use is not an easy task,because technology_ so repidly.A.Selecting a mobile phone for personal use is not an easy task,because technology_ so repidly.A.is changing.B.has changedC.will have changed.D.will.change.
Selecting a mobile phone for personal use is not an easy task,because technology_ so repidly.A.
Selecting a mobile phone for personal use is not an easy task,because technology_ so repidly.
A.is changing.B.has changed
C.will have changed.D.will.change.选什么?为什么?

Selecting a mobile phone for personal use is not an easy task,because technology_ so repidly.A.Selecting a mobile phone for personal use is not an easy task,because technology_ so repidly.A.is changing.B.has changedC.will have changed.D.will.change.
选A.
是说选手机不容易,因为科技进步太快.这里进步是持续动作,不是说已经完成了进步（B）或者将要进步（D）,或者将来会完成进步（C）.这里是将科技在持续进步,所以用简单的现在进行时就好,选A.