题文
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 |
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