He knew nothing about it ______ his friend told him.

【参考答案】

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......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)