15. I would say that, ______, I spend at least five hours a day in front of a computer screen.
(A) on average
(B) in average
(C) above average
(D) to average
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統計: A(99), B(94), C(28), D(13), E(0) #3887956
統計: A(99), B(94), C(28), D(13), E(0) #3887956