21. Let f(x) = [x] be the greatest integer function, where [x] is the greatest integer less than or equal to x. Which of the following items is the value of the integral 5ee33f0b2a705.jpg ?
(A) 3
(B) 6
(C) 5ee33f1ee21c3.jpg
(D) 8
(E)5ee33f2fb15a4.jpg

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統計： A(0), B(0), C(0), D(0), E(1) #2348356