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 |
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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 |