— I have got a pain in my back. 
— No wonder. You _____ in front of the computer too long.

A. have worked
B. are working
C. have been working
D. worked
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科目：高中英語 來源：0114 期中題 題型：單選題

— I have got a pain in my back. 
— No wonder. You _____ in front of the computer too long.
[     ]
A. have worked
B. are working
C. have been working
D. worked

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