Question

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

1. A.
   when
2. B.
   dring which
3. C.
   since then
4. D.
   since when

Answer 1

D
试题分析：考查非限制性定语从句。句意：1991年，李宁为体操运动员修建了一个学校，从那以后，他一直继续帮助年轻人实现他们的体育梦。句中有逗号，是非限制性定语从句，during which=when，since then不能引导定语从句，排除A、B、C。since when从那以后，符合题意。故选D。
考点：考查非限制性定语从句