Mary and I have been close friends ______ we met each other 10 years ago.
A．whenB．sinceC．untilD．a(chǎn)s
B

試題分析：考查連詞：A. when當…時候B. since自從C. until直到. As因為，句意：瑪麗和我自從10年前認識，一直是好朋友。選B。
點評：連詞的辨析要放在上下文去進行，同時要注意一些形式相近的連詞的詞義辨析。Since的用法還可以從時態(tài)判斷。
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