问题
选择题
Technology is developing so rapidly that _____ for only a year, my cellphone is out-of-date.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
答案
答案：B
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Technology is developing so rapidly that _____ for only a year, my cellphone is out-of-date.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 used
C. having used
D. is using
答案：B