Alandmark（里程碑）inthehistoryofsc

更新 2022-09-04
科目英语
题型选择题
难度中等
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A landmark（里程碑） in the history of science was made by a photo _______ was taken on April 10th about the black hole in a faraway galaxy（星系）．（　　）

A．

who

B．

which

C．

what

D．

when

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