Was it through Li Ning,

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答案是B.这是一个强调句,第二个空必须that.
第一个空填who was,构成一个定语从句.其中的i think 是插入语,做题时可以不看.
======以下答案可供参考======
供参考答案1:
B.who I think was, that
I think 插入语
.who I think was working at a high school 作Li Ning的定语从句
Was it through Li Ning， that you got to know Wang Ke? 强调句 的一般疑问形式！
听明白的话，请给满意！
供参考答案2:
B这是强调句， 被强调的是方式状语 through Li Ning, 接了个非限制性定语从句who I think was working at a high school， 即强调【是不是通过我认为是在一所中学工作的李宁你才开始熟悉王珂的？“】
语言点：被被强调的是状语时， 强调句后面的句子只能用that 引导。
【希望帮助到你，若有疑问，可以追问~~~
祝你学习进步，更上一层楼！(*^__^*)】
供参考答案3:
选【B】Li Ning, who i think was working这里who引导非限制性定语从句，一般关系代词在句中充当成分，这里who 在句中充当宾语；而A答案， who I think it was ...不缺句子成分；
Was it through Li Ning that your got...这是个强调句，强调through Li Ning方式状语,所以用that
有疑问的话，继续提！