已知f(x)={2x,x≥11,x<1f(x)=\begin{cases}2x, & x\geq1 \\ 1, & x<1\end{cases}f(x)={2x,1,x≥1x<1,则∫02f(x)dx=\int_{0}^{2}f(x)dx =∫02f(x)dx=( ).
(A)1
(B)2
(C)3
(D)4
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