单选题 He has made another discovery, ______ of great importance to science.
  • [A] which I think it is
  • [B] of which I think it is
  • [C] which I think is
  • [D] I think which is


【正确答案】 C
【答案解析】[考点] (1)非限制性定语从句(2)插入语
[解析] which引导非限定性定语从句。严格意义上说，插入语并不算句子成分，只是起到补充说明的作用。本句中插入语是I think。