Selecting a mobile phone for personal use is not an easy task because technology ________ so rapidly.
A．is changingB．has changed
C．will have changedD．will change
A

本句的主句一般現(xiàn)在時表達(dá)的是目前的情況，而“科技發(fā)展迅速”也是現(xiàn)階段正存在的一種狀態(tài)，不是在過去，也不是在將來，因此只能用現(xiàn)在進(jìn)行時表達(dá)。
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