Technology is developing so rapidly that...

Technology is developing so rapidly that for only a year , my cellphone is out-of-date .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

B 【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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