【题目】A scientist’s attempt to produce the world’s first gene-edited babies _____ are immune to HIV has sparked controversy in academia and the public.
A. as B. who
C. whom D. whose
在线课程【答案】B
【解析】
考查定语从句。句意为：一位科学家试图培育出世界上首个对HIV有免疫力的基因编辑婴儿，这在学术界和公众中引发了争议。定语从句的先行词为babies，且从句缺少主语，故用关系代词who引导从句。故选B。