Technology is developing so rapidly thatfor only a year , my cellphone is out-of-date .A.

Technology is developing so rapidly that for only a year , my cellphone is out-of-date .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

A. using (答案→)B. having been usedC. having usedD. 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。

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