单项选择题

Selecting a computer for personal use is no easy task because technology （） so rapidly.

A. is changing
B. has changed
C. will change

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单项选择题

My friend is an actor. He （） in several films so far.

A. appears
B. appeared
C. has appeared

单项选择题

Doctor Green, along with his assistants, （） on the project day and night to meet the deadline.

A. work
B. are working
C. is working

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