The great scientist became world-known in the early 1970s, he and another scientist made n
The great scientist became world-known in the early 1970s, he and another scientist made n
发布时间：2020-08-17 12:36:39
The great scientist became world-known in the early 1970s, he and another scientist made new discoveries about black holes. A. which B. where C. when D. then
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A. which B. where (答案→)C. when D. then 解析：考查定语从句。先行词是时间，引导词在从句中作时间状语。