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

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1. (2019·盘锦) A landmark(里程碑) in the history of science was made by a photo _______ was taken on April 10^th about the black hole in a faraway galaxy(星系).

A . who B . which C . what D . when

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