高中英语时态选择Selecting a mobilephone for personal use is no easy

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高中英语时态选择
Selecting a mobilephone for personal use is no easy task because technology ______ so rapidly.
A.is changing
B.has changed
C.will have changed
D.will change
THANX!
And I need the reason why you choose the option. Thanks again!

选A,句意是选择一个手机不是件容易的事,因为科技正在迅速的变化
强调的是科技正在变化,而不是已经变化或者将来变化,所以用现在进行式

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