The great scientist became world-known in the early 1970s,______ he and another scientist made new discoveries about black holes.
A．whichB．whereC．whenD．then
C
考查定語(yǔ)從句。先行詞是時(shí)間，引導(dǎo)詞在從句中作時(shí)間狀語(yǔ)。
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