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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．a(chǎn)s

B

解析試題分析：句意：自從我和瑪麗在十年前見面以來，我們就成了很親密的朋友。When當(dāng)……時(shí)候 since從……以來 until到……為止 as由于，選B。
考點(diǎn)：考查詞義辨析

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