Once they had______that he was not a spy, they agreed to release him.
单选题Once they had______that he was not a spy, they agreed to release him.
A.ascertained
B.ascribed
C.averted
D.asserted
参考答案：A
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答案解析：这句话的意思是：一旦确认他并非间谍，他们就同意将他释放。ascertain意为“确定、查明”；ascribe意为“归因于、归咎于”；avert意为“防止、转移”；assert意为“断言、主张”。根据句意，选项A为正确答案。
