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Mary and I have been close friends ______ we met each other 10 years ago.

A.when B.since C.until D.as

B

解析试题分析:句意:自从我和玛丽在十年前见面以来,我们就成了很亲密的朋友。When当……时候 since从……以来 until到……为止 as由于,选B。
考点:考查词义辨析

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