Selecting a mobile phone for personal use is not easy task because technology_____so rapidly.(2002 春 上海)

问题描述:

Selecting a mobile phone for personal use is not easy task because technology_____so rapidly.(2002 春 上海)
A.is changing \x05\x05\x05B.has changed
C.will have changed \x05\x05D.will change

A.is changing.
has changed 规在完成式表示变革这个动作已经完成,但事实上科技还在不断变革中,所要要选一个进行时态:is changing.