问题补充：
Was it through Li Ning, working at a high school, you got to know Wangke?
A. who I think it was; who
B. that I think were; which
C. who I think was; that
D. I think who was; which
答案：
A. who I think it was; who
B. that I think were; which
(答案→)C. who I think was; that
D. I think who was; which
解析：
第一空考查定语从句：修饰Li Ning，I think是插入语，所以填who I think was，who在定语从句中做主语，第二空填that是个强调句。句意是：你是通过在高中工作的李宁认识王珂的吗？选C。
