The ethical judgments of the Supreme Court justices have become an important issue recently.The court cannot_1_its legitimacy as guardian of the rule of law_2_justices behave like politicians.Yet,in several instances,justices acted in ways that_3_the court’s reputation for being independent and impartial.Justice Antonin Scalia,for example,appeared at political events.That kind of activity makes it less likely that the court’s decisions will be_4_as impartial judgments.Part of the problem is that the justices are not_5_by an ethics code.At the very least,the court should make itself_6_to the code of conduct that_7_to the rest of the federal judiciary.This and other similar cases_8_the question of whether there is still a_9_between the court and politics.The framers of the Constitution envisioned law_10_having authority apart from politics.They gave justices permanent positions_11_they would be free to_12_those in power and have no need to_13_political support.Our legal system was designed to set law apart from politics precisely because they are so closely_14_.Constitutional law is political because it results from choices rooted in fundamental social_15_like liberty and property.When the court deals with social policy decisions,the law it_16_is inescapably political-which is why decisions split along ideological lines are so easily_17_as unjust.The justices must_18_doubts about the court’s legitimacy by making themselves_19_to the code of conduct.That would make rulings more likely to be seen as separate from politics and,_20_,convincing as law.
本句句意是：法官必须对行为准则_____以此来解决对法院合法性的质疑。此题的理解需承接整个句子，首先此空所在后半句（by making themselves…）是一个方式状语，承接前半句说明法官怎样来解决有关法庭（裁决的）合法性的质疑。法官只有对行为准则负责，才能确保其裁决的公正和合理。因此选项[D]为正确答案。
