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Li Ning was able to set up a school for gymnasts in 1991, ______ he has continued to help young people to achieve their sporting ambitions.

A．when B．dring which C．since then D．since when

D

解析試題分析：考查非限制性定語從句。句意：1991年，李寧為體操運動員修建了一個學(xué)校，從那以后，他一直繼續(xù)幫助年輕人實現(xiàn)他們的體育夢。句中有逗號，是非限制性定語從句，during which=when，since then不能引導(dǎo)定語從句，排除A、B、C。since when從那以后，符合題意。故選D。
考點：考查非限制性定語從句

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