Selecting a mobile phone for personal use is not an easy task because technology so rapidly.
A. is changing
B. has changed
C. will have changed
D. will change
网友回答
(答案→)A. is changing
B. has changed
C. will have changed
D. will change
解析：本句的主句一般现在时表达的是目前的情况，而“科技发展迅速”也是现阶段正存在的一种状态，不是在过去，也不是在将来，因此只能用现在进行时表达。