问题
选择题
Choosing a mobile phone for personal use is not an easy task because technology _____ so fast. [ ]
A. has changed
B. would change
C. changed
D. is changing
答案
答案：D
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Choosing a mobile phone for personal use is not an easy task because technology _____ so fast. [ ]
A. has changed
B. would change
C. changed
D. is changing
答案：D