【題目】—Have you known Dr. Jackson for a long time?—Yes, since she ____ the Chinese Society.

A. has joined B. joins C. had joined D. joined

【答案】D

【解析】句意：-你認識杰克遜醫(yī)生很久了嗎？-是的，自從她加入了中國社會。A. has joined現(xiàn)在完成時；B. joins一般現(xiàn)在時；C. had joined過去完成時；D. joined一般過去式。主句是現(xiàn)在完成時，since后面從句用過去式，結合句意和語境可知選D。

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