I didn’t know he came back ______ I met him in the street.

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问题 I didn’t know he came back ______ I met him in the street.

选项 A、since
B、when
C、until

答案C

解析 考查连词固定搭配。not...until...是固定搭配,指“直到…才…”.符合句意逻辑。since引出从句,其前的语句应用完成时态,when引出时间状语从句,在此不合逻辑。
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