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Technology is developing so rapidly that   for only a year , my cellphone is out-of-date .
A.using B.having been usedC.having usedD.is using
B
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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