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