题目化简−a3−a 2−1a\sqrt{-{a}^{3}}-a{\;}^{2}\sqrt{-\frac{1}{a}}−a3−a2−a1的结果是（ ）A.−2a−a-2a\sqrt{-a}−2a−aB.−2aa-2a\sqrt{a}−2aaC.000D.2a−a2a\sqrt{-a}2a−a知识点：估算无理数的大小;最简二次根式章节：未标注
