Gaokao Math Practice Question
设全集 $U=\{-2,-1,0,1,2,3\}$, 集合 $A=\{-1,2\}, B=\left\{x \mid x^{2}-4 x+3=0\right\}$, 则 $C_{U}(A \cup B)=(\qquad)$
- A.$\{1,3\}$
- B.$\{0,3\}$
- C.$\{-2,1\}$
- D.$\{-2,0\}$
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