Technology is developing so rapidly that for only a year , my cellphone is out-of-date .
A. using
B. having been used
C. having used
D. is using
网友回答
A. using
(答案→)B. having been used
C. having used
D. is using
解析:考察非谓语动词,根据句子结构可知,该处为状语,排除D。use和他的逻辑主语my cellphone之间是被动关系,排除AC,所以选择B
意为,技术发展的如此迅速,以致于,尽管仅仅被使用了一年,我的手机已经过时了。