◎ 题干
Technology is developing so rapidly that _____ for only a year, my cellphone is out-of-date.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
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Technology is developing so rapidly that _____ for only a year, my cellphone is out-of-date.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 …”主要考查了你对  【现在分词的被动式】【现在分词的完成式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。