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．whenB．dring whichC．since thenD．since when
D

試題分析：考查非限制性定語從句。句意：1991年，李寧為體操運(yùn)動(dòng)員修建了一個(gè)學(xué)校，從那以后，他一直繼續(xù)幫助年輕人實(shí)現(xiàn)他們的體育夢(mèng)。句中有逗號(hào)，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。
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