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Technology is developing so rapidly that   for only a year , my cellphone is out-of-date .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
考察非謂語動詞，根據(jù)句子結(jié)構(gòu)可知，該處為狀語，排除D。use和他的邏輯主語my cellphone之間是被動關(guān)系，排除AC，所以選擇B
意為，技術(shù)發(fā)展的如此迅速，以致于，盡管僅僅被使用了一年，我的手機已經(jīng)過時了。
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