【題目】His brother has been to Stone Forest twice _______ he came to Yunnan．

A. after B. before C. since D. for

【答案】C

【解析】句意：自從他的哥哥來到云南以來，他已經(jīng)去過石林兩次了。主句使用的是現(xiàn)在完成時，從句使用一般過去時，故使用since連接，表示自從…，故答案選C。

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