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

A．when            B．since             C．until             D．a(chǎn)s

 

【答案】

B

【解析】

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。

考點：連詞辨析

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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