He knew nothing about it______his friend told him.

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问题 He knew nothing about it______his friend told him.

选项 A、until
B、because
C、if

答案A

解析考查连词。until经常与否定词连用，构成not(…)until搭配，表示“直到…(才…)”。本题中nothing是否定词，相当于not。because指“因为”，if指“如果”。都不符合句意逻辑。

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